为了帮助大家备考托福阅读，提高成绩，下面我给大家带来老托福阅读100篇passage 33试题及答案，希望大家喜欢!
老托福阅读100篇passage 33试题及答案
PASSAGE 33
Researchers in the field of psychology have found that one of the best ways to make an important decision, such as choosing a university to attend or a business to invest in, involves the utilization of a decision worksheet. Psychologists who study optimization compare the actual decisions made by people to theoretical ideal decisions to see how similar they are. Proponents of the worksheet procedure believe that it will yield optimal, that is, the best decisions. Although there are several variations on the exact format that worksheets can take, they are all similar in their essential aspects. Worksheets require defining the problem in a clear and concise way and then listing all possible solutions to the problem. Next, the pertinent considerations that will be affected by each decision are listed, and the relative importance of each consideration or consequence is determined. Each consideration is assigned a numerical value to reflect its relative importance. A decision is mathematically calculated by adding these values together. The alternative with the highest number of points emerges as the best decision.
Since most important problems are multifaceted, there are several alternatives to choose from, each with unique advantages and disadvantages. One of the benefits of a pencil and paper decision-making procedure is that it permits people to deal with more variables than their minds can generally comprehend and remember. On the average, people can keep about seven ideas in their minds at once. A worksheet can be especially useful when the decision involves a large number of variables with complex relationships. A realistic example for many college students is the question What will I do after graduation? A graduate might seek a position that offers specialized training, pursue an advanced degree, or travel abroad for a year.
A decision-making worksheet begins with a succinct statement of the problem that will also help to narrow it. It is important to be clear about the distinction between long-range and immediate goals because long-range goals often involve a different decision than short-range ones. Focusing on long-range goals, a graduating student might revise the question above to What will I do after graduation that will lead to successful career?
1. What does the passage mainly discuss?
(A) A tool to assist in making complex decisions.
(B) A comparison of actual decisions and ideal decisions
(C) Research on how people make decisions
(D) Differences between long-range and short-range decision making
2. The word essential in line 7 is closest in meaning to
(A) introductory
(B) changeable
(C) beneficial
(D) fundamental
3. The word pertinent in line 9 is closest in meaning to
(A) relevant
(B) preceding
(C) insightful
(D) responsive
4. Of the following steps, which occurs before the others in making a decision worksheet?
(A) Listing the consequences of each solution
(B) Calculating a numerical summary of each solution
(C) Deciding which consequences are most important
(D) Writing down all possible solutions
5. According to decision-worksheet theory, an optimal decision is defined as one that
(A) has the fewest variables to consider
(B) uses the most decision worksheets
(C) has the most points assigned to it
(D) is agreed to by the greatest number of people
6. The author develops the discussion in paragraph 1 by means of
(A) describing a process
(B) classifying types of worksheets
(C) providing historical background
(D) explaining a theory
7. The author states that On the average, people can keep about seven ideas in their minds at
once (lines 17-18) to explain that
(A) most decisions involve seven steps
(B) human mental capacity has limitations
(C) some people have difficulty making minor as well as major decisions
(D) people can learn to keep more than seven ideas in their minds with practice
8. The word succinct in line 24 is closest in meaning to
(A) creative
(B) satisfactory
(C) personal
(D) concise
9. Which of the following terms is defined in the passage ?
(A) Proponents (line 5)
(B) Optimal (line 5)
(C) Variables (line 17)
(D) Long-range goals (line 25)
10. The word it in line 24 refers to
(A) worksheet
(B) problem
(C) distinction
(D) decision
11. The word revise in line 26 is closest in meaning to
(A) ask
(B) explain
(C) change
(D) predict
PASSAGE 33 ADADC ABDBB C
托福阅读怎么抓住定位词
首先介绍一下，什么是定位词?
其实很简单，打个比方，你和朋友约好了去酒吧，朋友和你说酒吧在沈阳新东方正对面，这个酒吧你是不知道地点的，也就是你的目的地;而新东方却很熟知，那么你只需找到新东方便可以找到酒吧了。在这里新东方是已知的，就是用来定位的词汇，而酒吧则是你的目的所在，也便是你要找的答案。
定位词的称呼有很多，如关键词，主旨词，功能词，中心词等等。这些只是个名称罢了，含义都是一致的：一个可以根据题干回原文定位，并能够找到出处的词，这个题干中的词就是定位词 or key word。
定位词有什么样的特征?
定位词总体特征：不可变性和细节性
不可变性：定位词是用来定位的，所以必须找那些回原文依然不变的词汇，才有意义。通常不用动词和副词来定位。通常是名词或充当定语的形容词。
细节性：不要找大概念的词汇，更不要拿代表全文主旨的词汇来定位。换句话说不要找那些原文一大堆的词汇，无法定位。
如，95年英国剑桥委员会British Council给出的唯一样题 文章 的题目是:The Spectacular Eruption of Mount St.Helens
下面有一道选择题是“ According to the text the eruption of Mount St.Helens and other volcanoes has influenced our climate by…”
拿这道题为例，如果大家把Mount St.Helens 作为关键词回原文进行定位，那你会郁闷致死，全文主要讲的就是圣海伦斯火山的喷发，原文有N多个Mount St.Helens，所以即使这个词属于大写的专有名词，但他违背了细节性，是概括性的词汇，也不能作为定位词来寻找答案。
究竟哪些词在阅读当中充当定位词?
以下是定位词的分类：
1.特殊词汇
在阅读中有一些词张的比较特殊，这种词很容易被记住，也很容易回原文定位。
好比，在大街上上看到一个人光着身子跑步-------特殊难看
一个人的个子超高，像姚明一样------特殊长
一个人身上穿着10多种颜色的衣服，而且不停的摇头-----特殊怪
特殊怪，特殊长，特殊难
这三种词就是特殊词的所有特征，在文中看到这样的词，一定要警惕。如，
Sequoia 美洲杉 ---特殊怪，很好定位，也经常作为考点。
sodium 【化学】钠---特殊难，大家只要知道是一种化学元素足矣。
Simultaneous 同时的---特殊长，这种词本身的特点决定应作为定位词。
2.数字：通常指时间，金钱和百分比。
有一个道题目是这样问的：
“What are the dates of the TWO major eruptions before 1980?”
那么像1980 3185$ 69%这些词因为长相原因，段落全是英文，突然跑出来几个数字，十分显眼，也就很好回原文找到他们。
3.专有名词：斜体字，大写人名,地名，大写的专有名词，这一点大家都很熟悉，不用多说。
4.特殊符号：
在特殊符号里或者旁边的词，最好通过符号回原文进行定位，如“paper conversation”，(three cubic miles) 这些词本身并没有什么特别，但放在符号里面，就可以根据符号回原文进行寻找。
总之，在国外考试的阅读中，无论是阅读文章，还是回答后面的10几道题目，定位词的寻找，都是一种有效的应试策略，更是学术文章的阅读的重要 方法 。
托福阅读不同题型的方法和技巧
一、单词题目
平时注意单词量的积累，力求达到可以随时随地记忆单词的境界。其实我们在记忆单词的时候也可以适当地使用一些策略，那就是在我们可以把自己的侧重点放在动词和形容词的记忆上。考试过后，你就会发现这个策略的事半功倍了。此外，对于自己不认识的单词，我们应该主动回原文找 同义词，或找相关的提示信息。
二、找代词指代对象的题目
在考试中，它们主要会以如下两种形式出现。
(1)it、one、their、its、that类，这种题目主要是考查我们对于并列关系的掌握，这时，我们应该主动去看这个词所在的那整句话，从已知话中找到处于相同地位的词。
(2)考查由that、which涉及到的定语从句类，我们在面对这种题目时，应该有意识的在选项中找从句中谓语动词的发起者或接受者，因为只有这样才可以迈出通向胜利的第一步。
三、考查文章内容的题目
在历次的托福考试中，也存在着两大主要题型，即：文章细节考查题和文章结构考查题。
1、文章细节考查题
解答文章细节考查题，我们一般都可以回到原文中去做定位，找到相近或相似的内容，进而得出答案。
常见的定位有以下3种：
(1)题目本身给出定位。
(2)至少先可作出一个段落的定位。
(3)位置多夹于前后两题位置之间。
2、文章结构考查题
一定要注意：
(1)千万不要根据你读的信息去作推理。
(2)不要把文章从头到尾当成一个整体，尽可能各段独立。
(3)根据 经验，在考试中，整篇文章的最后一句出题较多，所以应该仔细阅读这个重要的 句子 。
以上是针对托福考试阅读部分的常见题型做出的一些有关于考试解题方法与技巧的分项介绍。
在整个的阅读考试中，我们还应该了解到：
(1)在这个特殊的考试时间段内，我们的记忆比理解更为重要，在解题的时候一定要完全忠实于原文，切忌私自做出任何的主观臆断。
(2)在做题步骤方面，我们可以先简读原文(主要是各个段落的第一，二句话)，而后阅读题目，最后观察选项做出判断。值得我们特别注意的是，我们在做出判断的时候，切忌不要选择在选项中存在比较，而在原文中没有明确表示过的项目;切忌不要去选择那些说法过于绝对化的选项。
为了帮助大家备考托福阅读，提高成绩，下面我给大家带来托福阅读TPO24(试题+答案+译文)第2篇:Breathing During Sleep，希望大家喜欢!
托福阅读原文
【1】Of all the physiological differences in human sleep compared with wakefulness that have been discovered in the last decade, changes in respiratory control are most dramatic. Not only are there differences in the level of the functioning of respiratory systems, there are even changes in how they function. Movements of the rib cage for breathing are reduced during sleep, making the contractions of the diaphragm more important. Yet because of the physics of lying down, the stomach applies weight against the diaphragm and makes it more difficult for the diaphragm to do its job. However, there are many other changes that affect respiration when asleep.
【2】During wakefulness, breathing is controlled by two interacting systems. The first is an automatic, metabolic system whose control is centered in the brain stem. It subconsciously adjusts breathing rate and depth in order to regulate the levels of carbon dioxide (CO2) and oxygen (O2), and the acid-base ratio in the blood. The second system is the voluntary, behavioral system. Its control center is based in the forebrain, and it regulates breathing for use in speech, singing, sighing, and so on. It is capable of ignoring or overriding the automatic, metabolic system and produces an irregular pattern of breathing.
【3】During NREM (the phase of sleep in which there is no rapid eye movement) breathing becomes deeper and more regular, but there is also a decrease in the breathing rate, resulting in less air being exchanged overall. This occurs because during NREM sleep the automatic, metabolic system has exclusive control over breathing and the body uses less oxygen and produces less carbon dioxide. Also, during sleep the automatic metabolic system is less responsive to carbon dioxide levels and oxygen levels in the blood. Two things result from these changes in breathing control that occur during sleep. First, there may be a brief cessation or reduction of breathing when falling asleep as the sleeper waxes and wanes between sleep and wakefulness and their differing control mechanisms. Second, once sleep is fully obtained, there is an increase of carbon dioxide and a decrease of oxygen in the blood that persists during NREM.
【4】But that is not all that changes. During all phases of sleep, several changes in the air passages have been observed. It takes twice as much effort to breathe during sleep because of greater resistance to airflow in the airways and changes in the efficiency of the muscles used for breathing. Some of the muscles that help keep the upper airway open when breathing tend to become more relaxed during sleep, especially during REM (the phase of sleep in which there is rapid eye movement). Without this muscular action, inhaling is like sucking air out of a balloon—the narrow passages tend to collapse. Also there is a regular cycle of change in resistance between the two sides of the nose. If something blocks the "good" side, such as congestion from allergies or a cold, then resistance increases dramatically. Coupled with these factors is the loss of the complex interactions among the muscles that can change the route of airflow from nose to mouth.
【5】Other respiratory regulating mechanisms apparently cease functioning during sleep. For example, during wakefulness there is an immediate, automatic, adaptive increase in breathing effort when inhaling is made more difficult (such as breathing through a restrictive face mask). This reflexive adjustment is totally absent during NREM sleep. only after several inadequate breaths under such conditions, resulting in the considerable elevation of carbon dioxide and reduction of oxygen in the blood, is breathing effort adjusted. Finally, the coughing reflex in reaction to irritants in the airway produces not a cough during sleep but a cessation of breathing. If the irritation is severe enough, a sleeping person will arouse, clear the airway, then resume breathing and likely return to sleep.
【6】Additional breathing changes occur during REM sleep that are even more dramatic than the changes that occur during NREM. The amount of air exchanged is even lower in REM than NREM because, although breathing is more rapid in REM,it is also more irregular, with brief episodes of shallow breathing or absence of breathing. In addition, breathing during REM depends much more on the action of the diaphragm and much less on rib cage action.
托福阅读试题
1.According to paragraph 1, which of the following can be inferred about the diaphragm during sleep?
A.During sleep the diaphragm requires increased movement of the rib cage.
B.The diaphragm helps with breathing as movements of the rib cage decrease during sleep.
C.The diaphragm requires a great amount of pressure to function properly.
D.The diaphragm contributes to the effective functioning of the rib cage.
2.According to paragraph 2, all of the following are true of the voluntary breathing system EXCEPT:
A.It has its control center in the brain stem.
B.It controls breathing for a number of activities during wakefulness.
C.It is able to bypass the automatic system.
D.It produces an irregular breathing pattern.
3.The word exclusive in the passage (paragraph 3) is closest in meaning to
A.consistent
B.perfect
C.partial
D.sole
4.According to paragraph 3, which of the following may occur just before NREM sleep begins?
A.The automatic, metabolic system may increase its dependence on air exchanges.
B.Breathing can stop for a short time as a person falls asleep.
C.An increase in the oxygen level in the blood can occur as sleep becomes fully obtained.
D.The level of carbon dioxide in the blood may drop suddenly.
5.What is the author's purpose in stating that inhaling is like sucking air out of a balloon?(in paragraph 4)
A.To refute the argument that additional effort is necessary for breathing during sleep.
B.To argue that REM sleep is more important than NREM sleep.
C.To illustrate the difficulty of breathing during sleep.
D.To illustrate how blockage of narrow passages can be prevented during sleep.
6.All of the following are mentioned in paragraph 4 as being characteristic of breathing during sleep EXCEPT
A.relaxation of the muscles involved in the respiratory system.
B.changes in resistance between the two sides of the nose.
C.easier airflow in the passages of the upper airway.
D.absence of certain complex muscle interactions.
7.According to paragraph 5, what happens during NREM sleep when inhaling is difficult?
A.There is an immediate, automatic, adaptive increase in breathing effort.
B.The sleeping person takes several inadequate breaths before the breathing effort is adjusted.
C.The coughing reflex causes the breathing effort to adjust.
D.The airways become cleared as the blood removes irritants.
8.It can be inferred from paragraph 5 that a very mild irritation during sleep will likely cause the sleeping person to
A.increase the breathing effort.
B.wake up and remove the source of irritation.
C.cough while still sleeping.
D.stop breathing temporarily while still sleeping.
9.The word considerable (paragraph 5)meaning to
A.significant.
B.Steady.
C.Usual.
D.necessary.
10.The word resume in the passage (paragraph 5) is closest in meaning to
A.reduce.
B.stop.
C.readjust.
D.restart.
11.Which of the sentences below best expresses the essential information in the highlighted sentence in the passage (paragraph 6)? Incorrect choices change the meaning in important ways or leave out essential information.
A.Because breathing is more shallow and irregular in REM than in NREM, less air is exchanged in REM.
B.Breathing in NREM is less effective than breathing in REM because of irregular episodes of rapid breathing during NREM.
C.Because breathing is more rapid in NREM sleep than in REM sleep, breathing often becomes shallow.
D.Although REM has brief episodes of shallow breathing or lack of breathing, breathing is more rapid than in NREM.
12. Look at the four squares [■] that indicate where the following sentence could be added to the passage. Where would the sentence best fit? Click on a square to add the sentence to the passage. To better understand breathing during sleep, it is, however, helpful to first understand how respiration works in general.
paragraph1: Of all the physiological differences in human sleep compared with wakefulness that have been discovered in the last decade, changes in respiratory control are most dramatic. Not only are there differences in the level of the functioning of respiratory systems, there are even changes in how they function. Movements of the rib cage for breathing are reduced during sleep, making the contractions of the diaphragm more important. [■]【A】 Yet because of the physics of lying down, the stomach applies weight against the diaphragm and makes it more difficult for the diaphragm to do its job. [■]【B】 However, there are many other changes that affect respiration when asleep.
paragraph2: [■]【C】 During wakefulness, breathing is controlled by two interacting systems. [■]【D】The first is an automatic, metabolic system whose control is centered in the brain stem. It subconsciously adjusts breathing rate and depth in order to regulate the levels of carbon dioxide (CO2) and oxygen (O2), and the acid-base ratio in the blood. The second system is the voluntary, behavioral system. Its control center is based in the forebrain, and it regulates breathing for use in speech, singing, sighing, and so on. It is capable of ignoring or overriding the automatic, metabolic system and produces an irregular pattern of breathing.
13.Directions: From the seven statements below, select the statements that correctly characterize breathing during wakefulness and those statements that correctly characterize breathing during sleep. Drag each answer choice you select into the appropriate box of the table. Two of the answer choices will NOT be used. This question is worth 3 points.
A.The role of the rib cage increases and the role of the diaphragm decreases.
B.Carbon dioxide in blood rises and oxygen drops.
C.The coughing reflex is extremely complex.
D.A great deal of effort is used for breathing.
E.Upper airways are resistant to colds and allergies.
F.There is a drop in the volume of air that is exchanged.
G.Automatic and voluntary respiratory systems are both involved.
1 )
Wakefulne
A B C D E F G
2 )
Sleep
A B C D E F G
托福 阅读答案
1.以diaphragm做关键词定位至第三句和第四句，说ribcage运动变少，使得diaphragm更重要，但stomach的压力使得diaphragm工作起来更困难，B是正确答案。A的increased movement of the rib cage和C的需要pressure都与原文相反;D说diaphragm contributes to原文没有说。
2.EXCEPT题，排除法。A的centered in brain stem做关键词定位至第一句，但原文说这个特点是属于automatic，metabolic system的，而voluntary的center是在forebrain，所以A错，选;B的a number of activities做关键词定位至倒数第二句的一大堆活动，所以B正确，不选;C的bypass the automatic system和D的irregular breathing pattern做关键词都定位至最后一句，都正确，不选。
3.exclusive仅有，只有，排他，所以正确答案是sole。从单词本身看，include→exclude→exclusive，所以一定能得出排他之意。原句说在NREM期间，automatic系统怎么控制breathing，使得氧的需求量减少，前面一直在说两个系统，现在氧的需求量减少了，肯定是有系统不干活了，所以就是只有automatic在干活，所以答案是D只有。A持续、B完美，都不靠谱，C的partial刚好与原文意思相反，也不选。
4.此题关键词难找，可以顺序向下看，也可以用排除法，如果顺序向下看的话，会看到第一点说的是当sleeper在睡与醒之间摇摆的时候，发生了呼吸cessation，也就是stop，所以正确答案是B，stop for a short time。C和D一个说氧上升一个说二氧化碳下降，是一回事，都不是在睡觉期间发生的，所以都反了，而且两个一样的也都不选，A没说。
5.修辞目的题，先看修辞点所在的 句子，但原句整个都是一个例子，往前看。前一句仍然在说肌肉relax的事情，因此也是例子，所以看开头，开头说air passage在睡觉期间变了很多紧接着就解释睡觉期间呼吸很难，也就是开头所指的变化是睡觉的时候呼吸变难，所以正确答案是C。A的refute与原文相反;B的比较和D的prevent blockage原文都没说。
6.EXCEPT题，排除法。A的relaxation of the muscles做关键词定位至第三句，正确，不选;B的two sides of the nose做关键词定位至倒数第三句，正确，不选;C的upper airway做关键词定位至第三句，但答案的easier airflow原文完全没说，C错，选;D的complex muscle interaction做关键词都定位至最后一句，正确，不选。
7.以inhaling is difficult做关键词定位至第二句，但这句只说了difficult的事儿，没说发生了什么，往下看。下句说NREM期间什么adjustment都没有，只有在inadequate breaths之后才adjust，所以答案是B。A是wakeful时候才有的;C的因果关系原文没说;D完全没说。
8.以irritation做关键词定位至最后一句，说如果irritation太严重，睡着的人就会醒，按照正常的叙述顺序应该是先叙述mild的情况，前一句果然在说coughing reflex没产生cough，而产生了cessation of breathing，呼吸停止的状况，所以答案是D。C与原文相反;B是severe的时候才有的，A没说。
9.considerable可观的，相当的，重要的，所以正确答案是significant。从单词本身看，consider的考虑的意思是很常见的，加形容词词尾able变为值得考虑的，所以也是significant。原文说在若干次inadequate breaths之后，二氧化碳含量怎么上升氧气含量下降，才能调整breathing，一般我们说显著的变化，所以答案A，其他答案都不靠谱。
10.resume重新开始，再继续，所以正确答案是restart。原句说如果irritation太严重了，睡着的人会醒来，清理呼吸道，并且怎么呼吸，前一句都说了因为irritants呼吸停止，然后醒来，当然清理完就继续呼吸了呗，答案是D。A和B完全不靠谱，如果选C，之前应该adjust一次，但之前从来没说irritation严重的时候有先调整一次，所以C错。
11.原句的结构是exchange lower是因为blabla，所以正确答案是A，因果关系和结构都正确。其他答案都没提到exchange lower这个主干，而且B把原文非主干的部分变成了主干;C结果搞乱;D逻辑关系错。
12.两个过渡点，名词respiration和连词however。根据respiration可以初步确定答案是B或者C，但根据however断定B不对，因为两个however不能连续出现，所以正确答案是C。
13.第一段和第二段在讲wakeful部分，其余在讲sleep部分。The role选项对应第一段第三句，属于wakeful部分。Carbon dioxide选项对应第五段第四句，二氧化碳多氧少，属于sleep部分。The coughing选项原文没说reflex复杂，不属于任何一列，不选。A great deal选项对应原文第四段第三句，属于sleep部分。Upper airways选项原文没说，不选。There is选项对应原文第六段第二句，属于sleep部分。Automatic选项对应原文第二段首句，属于wakeful部分。
托福阅读译文
【1】关于人类睡觉和清醒时生理状态的差异在过去的十年里已被发现，在所有的这些差异中，呼吸系统控制方面的变化尤其引人注目。不仅是呼吸系统运作水平有差异，在如何运作方面也出现了变化。胸腔所做的呼吸运动在睡觉时会减少，使得横膈膜的收缩变得更为重要。然而由于躺下来的物理作用，胃部压迫横膈膜使得横膈膜难以工作。不管怎样，睡眠时还有很多其他的变化影响着呼吸。
【2】清醒的时候，呼吸受到两个互相影响的系统的控制。第一个是自动的新陈代谢系统，它的控制中心在脑干。它会潜意识的调整呼吸频率和深度来控制二氧化碳和氧气的浓度以及血液中的酸碱比。第二套系统是自发行为系统。它的控制中心在前脑，调节说话、 唱歌 、叹息等行为时的呼吸。它能忽略或无视自动新陈代谢系统并且产生无规律的呼吸模式。
【3】在NMER(睡觉时没有快速眼部活动的阶段)这个阶段中，呼吸会变得更深更有规律，但是呼吸频率会降低，导致总体空气交换减少。发生这个是因为在NREM睡眠阶段中，自动的新陈代谢系统会独自控制呼吸，身体会利用更少的氧气产生更少的二氧化碳。同时，自动的新陈代谢系统对血液中二氧化碳和氧气的含量反应并不灵敏。在睡眠中呼吸控制的变化会导致两个结果。第一，睡着时呼吸可能会有短暂的停止或减少，因为睡眠者在睡眠和清醒之间徘徊，而这两种状态的控制系统不一样。第二，一旦得到了充足的睡眠，血液中二氧化碳含量升高而氧气含量降低，在NREM阶段也会持续这样。
【4】但这并不是全部的变化。在睡眠的所有阶段中，气道的一些变化已经被观察到了。睡眠时需要付出两倍的努力去呼吸，因为呼吸道气流的阻力会比较强并且用来呼吸的肌肉的效率会有变化。一些在呼吸时帮助保持上呼吸道通畅的肌肉在睡觉的时候会变得松弛，特别是在REM阶段(就是有快速眼部运动的睡眠阶段)。没有这种肌肉运动，呼吸空气就像从气球里吸气一样，狭窄的通道会面临崩溃。而且鼻子两侧的阻力也会周期性改变。如果有时候堵塞了“好”的一边，比如过敏和感冒引起的堵塞，阻力就会大大增加。与这些因素一起的是那些能够改变从鼻子到嘴巴的气流路径的肌肉之间失去了复杂的交互。
【5】其他呼吸调节机制在睡眠时显然要停止运作。比如说，在清醒时如果呼吸变得困难的话就会有一个立即自动适应性的呼吸增强(比如戴上面具呼吸)。但在NREM状态时完全不存在这样反射性的调节。在这种情况下，只有几次不充分的呼吸后使得血液中二氧化碳的含量显著提升以及氧气的含量降低，呼吸才会被调整过来。最后，咳嗽反应在应对呼吸道中刺激物时产生的不是睡觉时咳嗽而是呼吸停止。如果刺激物足够严重，睡着的人会醒来清理气道，然后继续呼吸很可能再度入睡。
【6】发生在REM时期的多余的呼吸变化比发生在NREM时期的呼吸变化更显著。REM的空气交换量要比NREM低，因为尽管REM中呼吸更加急促，但也更加没有规律，包括一些简短的浅呼吸或呼吸暂停。另外，REM时期的呼吸更多取决于横膈膜而不是胸腔的作用。
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为了帮助大家备考托福阅读，提高成绩，下面我给大家带来托福阅读TPO21(试题+答案+译文)第一篇:Geothermal Energy，希望大家喜欢！
托福阅读原文
【1】Earth's internal heat, fueled by radioactivity, provides the energy for plate tectonics and continental drift, mountain building, and earthquakes. It can also be harnessed to drive electric generators and heat homes. Geothermal energy becomes available in a practical form when underground heat is transferred by water that is heated as it passes through a subsurface region of hot rocks (a heat reservoir) that may be hundreds or thousands of feet deep. The water is usually naturally occurring groundwater that seeps down along fractures in the rock; less typically, the water is artificially introduced by being pumped down from the surface. The water is brought to the surface, as a liquid or steam, through holes drilled for the purpose.
【2】By far the most abundant form of geothermal energy occurs at the relatively low temperatures of 80° to 180° centigrade. Water circulated through heat reservoirs in this temperature range is able to extract enough heat to warm residential, commercial, and industrial spaces. More than 20,000 apartments in France are now heated by warm underground water drawn from a heat reservoir in a geologic structure near Paris called the Paris Basin. Iceland sits on a volcanic structure known as the Mid-Atlantic Ridge. Reykjavik, the capital of Iceland, is entirely heated by geothermal energy derived from volcanic heat.
【3】Geothermal reservoirs with temperatures above 180° centigrade are useful for generating electricity. They occur primarily in regions of recent volcanic activity as hot, dry rock; natural hot water; or natural steam. The latter two sources are limited to those few areas where surface water seeps down through underground faults or fractures to reach deep rocks heated by the recent activity of molten rock material. The world's largest supply of natural steam occurs at The Geysers, 120 kilometers north of San Francisco, California. In the 1990s enough electricity to meet about half the needs of San Francisco was being generated there. This facility was then in its third decade of production and was beginning to show signs of decline, perhaps because of over development. By the late 1990s some 70 geothermal electric-generating plants were in operation in California, Utah, Nevada, and Hawaii, generating enough power to supply about a million people. Eighteen countries now generate electricity using geothermal heat.
【4】Extracting heat from very hot, dry rocks presents a more difficult problem: the rocks must be fractured to permit the circulation of water, and the water must be provided artificially. The rocks are fractured by water pumped down at very high pressures. Experiments are under way to develop technologies for exploiting this resource.
【5】Like most other energy sources, geothermal energy presents some environmental problems. The surface of the ground can sink if hot groundwater is withdrawn without being replaced. In addition, water heated geothermally can contain salts and toxic materials dissolved from the hot rock. These waters present a disposal problem if they are not returned to the ground from which they were removed.
【6】The contribution of geothermal energy to the world's energy future is difficult to estimate. Geothermal energy is in a sense not renewable, because in most cases the heat would be drawn out of a reservoir much more rapidly than it would be replaced by the very slow geological processes by which heat flows through solid rock into a heat reservoir. However, in many places (for example, California, Hawaii, the Philippines, Japan, Mexico, the rift valleys of Africa)the resource is potentially so large that its future will depend on the economics of production. At present, we can make efficient use of only naturally occurring hot water or steam deposits. Although the potential is enormous, it is likely that in the near future geothermal energy can make important local contributions only where the resource is close to the user and the economics are favorable, as they are in California, New Zealand, and Iceland. Geothermal energy probably will not make large-scale contributions to the world energy budget until well into the twenty-first century, if ever.
托福阅读试题
1.According to the processes described in paragraph 1, what is the relationship between radioactivity and the steam produced by geothermal heat?
A.Geothermally heated steam is produced when water is exposed to radioactivity deep underground.
B.When water is introduced into holes drilled thousands of feet in the ground, it becomes radioactive and turns to steam.
C.Radioactivity heats Earth's interior rock, which in turn can heat water to the point it becomes steam.
D.When a reservoir of steam in subsurface rock is produced by radioactivity, it is said to be geothermally heated.
2.The word "practical" in paragraph 1 is closest in meaning to
A.usable.
B.plentiful.
C.economical.
D.familiar.
3.The word "abundant" in paragraph 2 is closest in meaning to
A.economical.
B.familiar.
C.plentiful.
D.useful.
4.According to paragraph 2, which of the following is true about heat reservoirs with a temperature in the range of 80°to 180° centigrade?
A.They are under international control.
B.They are more common than reservoirs that have a higher temperature.
C.Few of them produce enough heat to warm large industrial spaces.
D.They are used to generate electricity.
5.According to paragraph 3, what is the connection between underground faults and naturally occurring steam?
A.Underground faults enable the heat from molten-rock material to escape upward to regions where it can heat surface water enough to produce steam.
B.Underground faults are created by steam that is produced in geothermal reservoirs deep inside Earth.
C.Underground faults create spaces in which natural steam is sometimes trapped.
D.Underground faults allow surface water to reach deep rocks that are hot enough to turn it into steam.
6.In paragraph 3, why does the author mention that in the 1990s The Geysers was in its third decade of production?
A.To provide the historical context of the geothermal production of electricity in the United States.
B.To imply that The Geysers was the first geothermal site to be put into production in California.
C.To help explain the signs of decline shown by The Geysers.
D.To explain why 70 new geothermal sites were put into electricity production in the late 1990s.
7.Which of the following can be inferred from paragraphs 2 and 3 about geothermal reservoirs?
A.Volcanic heat is associated only with geothermal reservoirs that have a temperature over 180° centigrade.
B.More countries produce power from geothermal reservoirs than use them for heating buildings.
C.Most geothermal reservoirs are suitable for producing electricity.
D.A higher geothermal reservoir temperature is needed to generate electricity than is needed to heat homes.
8.According to paragraph 4, extracting heat from very hot, dry rocks is difficult in part because
A.the underground rock must be fractured before heat can be removed from it.
B.the water above the rock is under very high pressure.
C.the rock breaks apart when water is pumped into it.
D.the water circulated through the rock must be much cooler than the rock itself.
9.The word "exploiting" in paragraph 4 is closest in meaning to
A.locating.
B.increasing.
C.making use of.
D.estimating the size of.
10.How is the problem that the surface may sink related to the problem that water heated geothermally may contain toxic materials?
A.Both problems could be solved by returning groundwater that is removed from an underground heat reservoir back to the reservoir after heat is extracted from it.
B.The problem of sinking is more difficult to solve than is the problem of toxic materials.
C.Land at the surface sinks because the rock beneath the surface is weakened when salts and toxic materials are removed from it in the process of extracting geothermal energy.
D.Both problems are caused by the fact that the hot groundwater in a heat reservoir dissolves the rock, which weakens the rock and makes the water toxic with salt.
11.Which of the sentences below best expresses the essential information in the highlighted sentence in paragraph 6? Incorrect choices change the meaning in important ways or leave out essential information.
A.Heat flows through solid rock very slowly, so it takes a very long time for geological processes to produce a reservoir of geothermal energy.
B.Geothermal energy is not renewable because heat flows very slowly through solid rock into or out of a heat reservoir.
C.The heat quickly removed from a heat reservoir is replaced so slowly by geological processes that geothermal energy is not practically speaking, renewable.
D.In most cases, heat travels into a heat reservoir so slowfy that it is a much quicker process to remove the heat from a reservoir than to replace it.
12.In paragraph 6, the author implies that in California, Hawaii, the Philippines, Japan, Mexico, and the rift valleys of Africa the potential size of the geothermal resource is so large that
A.it might be economically worth developing these sites even though geothermal energy is not renewable.
B.these sites will be the first geothermal energy sites to be developed with new technology.
C.these sites are likely to make a large-scale contribution to the world energy budget in the twenty-first century.
D.it does not matter whether they have naturally occurring deposits of hot water or steam.
13. Look at the four squares [■] that indicate where the following sentence could be added to the passage. Where would the sentence best fit? Click on a square to add the sentence to the passage. In either case, the heated water will usually be under considerable pressure, and so may have a temperature that is well above its sea-level boiling point of 100° centigrade.
Earth's internal heat, fueled by radioactivity, provides the energy for plate tectonics and continental drift, mountain building, and earthquakes. It can also be harnessed to drive electric generators and heat homes. Geothermal energy becomes available in a practical form when underground heat is transferred by water that is heated as it passes through a subsurface region of hot rocks (a heat reservoir) that may be hundreds or thousands of feet deep. ■【A】The water is usually naturally occurring groundwater that seeps down along fractures in the rock; less typically, the water is artificially introduced by being pumped down from the surface. ■【B】The water is brought to the surface, as a liquid or steam, through holes drilled for the purpose.■【C】
By far the most abundant form of geothermal energy occurs at the relatively low temperatures of 80° to 180° centigrade. ■【D】Water circulated through heat reservoirs in this temperature range is able to extract enough heat to warm residential, commercial, and industrial spaces. More than 20,000 apartments in France are now heated by warm underground water drawn from a heat reservoir in a geologic structure near Paris called the Paris Basin. Iceland sits on a volcanic structure known as the Mid-Atlantic Ridge. Reykjavik, the capital of Iceland, is entirely heated by geothermal energy derived from volcanic heat.
14. Directions: An introductory sentence for a brief summary of the passage is provided below. Complete the summary by selecting the THREE answer choices that express the most important ideas in the passage. Some sentences do not belong in the summary because they express ideas that are not presented in the passage or are minor ideas in the passage. This question is worth 2 points.
Heat reservoirs in the form of hot rock far beneath Earth's surface are a potential source of usable geothermal energy.
A.Heat reservoirs with a temperature from 80° to 180° centigrade can be used, as in France and Iceland, to heat buildings.
B.A number of countries now use geothermal reservoirs that contain water or steam above 180° centigrade to generate electricity.
C.Most heat reservoirs with a temperature above 180° centigrade cannot be used for energy because they are usually too close to recent volcanic activity.
D.The sinking of land above heat reservoirs and other environmental problems arise when water is pumped into a heat reservoir under high pressure.
E.Experiments are under way to determine if geothermally heated waters could be used as a source of certain minerals that have been dissolved out of hot rocks deep within Earth.
F.A number of issues, including how to extract heat from reservoirs that do not have a natural supply of water, will significantly limit the use of geothermal energy for the foreseeable future.
托福 阅读答案
1.细节题，问radioactivity和steam的关系，所以找双关键词，分别定位至本段第一句和最后一句，第一句说radioactivity提供了地球的内热，最后一句说水变成蒸汽到达地表，水受热才能蒸汽，而这份热量是geothermal energy提供的，这就是二者的关系，所以答案是C。A的水暴露在radioactive underground时候steam产生没说;B水变成radioactive没说;D的radioactivity产生蒸汽更不靠谱。
2.practical实际的，可用的，答案是A的usable，此题简单，B plentiful大量的、C economical节省的和D familiar熟悉的，完全不对。
3.abundant大量的，充足的，所以答案是C的plentiful，我怀疑这个题的选项是不是跟上一道题弄混了，待定。不过C肯定是对的。此题也较简单，其他答案完全不沾边，不会的各位最好认真背单词了。
4.以80到180度做关键词定位至第一句，说最丰富的geothermal energy是在80到180度范围内的，所以同义替换是B的more common than higher temperature。A的international control原文没说;C与本段第二句说反;D在本段没提，但下一段说高于180度的可以用来发电，所以D说反了。
5.又是一个问两者关系的题，找双关键词，定位至第三句，说natural hot water和natural steam仅存在于那些地点，地表水通过fault或者fracture渗到地下，碰到被加热的blabla，答案明显是D。A说fault使heat跑上来，和原文的方向说反了，原文是水跑下去;B说steam创造了fault完全不靠谱;C的steam被trap原文没说。
6.修辞目的题，先读例子所在句，只是细节，按照常规应该往前看，但前一句已经在上题看过，与答案无关，所以往下看，而且看下一句另外一个原因是因为代词this，下句说G经历了30年的运作，已经显示衰败迹象，可能是因为过度开发，所以答案是C，A和B的内容原文没提;D本身也是个细节。
7.此题用排除法更快，A与第二段首句说反，错;第二段只是说geothermal energy可以用来加热building，没说most，B错;C和D都可以从两段的首句看出来，第二段说最多的是在80到180度，第三段说发电需要180度以上，所以发电比别的温度高，D对，C说反。
8.整个问题做关键词定位至第一句，说从hot, dry rock抽热量是特别难的，必须先fracture rock，水也要人工引入，所以答案是A。D没说，B和C原文确实有说，但没有回答为什么难，也就是那种答非所问选项，所以也不对。
9.exploit开发，利用，剥削压榨，所以C的making use of正确。原文说人们正在实践新的技术来怎么样这种资源，B很显然不对，资源如果想加就加那就好了;A定位和D估计数量都太初级了，而且现在的技术就可以定位和算储量，明显不应该是under way。
10.又是一个问两者关系的题，本来应该找双关键词，但这段实在太短，找关键词还不如读完，快速扫完之后发现这两件事情都是由于开采地下水引起的问题，而且最后一句说如果不把地下水补充回去就会有问题，所以答案是A。两个问题之间是并列关系，既没有比较也没有因果，所以B和C都不对;D的dissolved溶解原文没说，也不对。
11.原句的结构是geothermal energy是不renewable的，因为blabla，所以前面的结果一定要有，A和D排除;原句的原因中有一个比较，说draw out比replace的快，C重现了这个比较，B没有，所以正确答案是C。
12.修辞目的题，先读细节所在句，说在这些资源如此充足的地方，资源的利用前景取决于economies of production生产经济，四个答案中只有A提到了开采是否划算的问题，所以答案是A。B和D原文直接没说;C跑到最后一句去了，跟例子也没什么关系，注意倒数第二句MS也有例子，但是题目问的不是那个。
13.这道题有一个过渡点就够了，in either case说明正确插入点之前必须有两种情况，直接确定B，因为之前有usually和less typically两种情况。
14.Heat选项对应原文第二段，正确;注意不要因为温度和国家把这个选项当成细节，即使当成细节，也可以凭其他选项都不对的排除法解决。Most heat选项与原文第三段首句说反，不选。Experiments选项MS对应原文第四段最后一句，但原文说的是利用热能，不是矿物，所以这个选项不选。A number of countries选项对应原文第三段首句，正确;注意不要因为温度把这个选项当成细节。The sinking选项不知所云，好像有语法错误，不知道是不是我的TPO版本问题，但即使这个选项语法没问题，说的也应该是第五段的细节，或者是干脆没说，所以不选。A number of issues选项对应原文第六段，正确。
托福阅读译文
【1】地球内部因放射产生的热量为板块运动、大陆漂移、造山运动和地震提供了能量。这种热量还可以用来驱动发电机发电以及为家庭供暖。水流经地表下可能几百甚至几千英尺深的热岩区域(一种热储)被加热，当被加热的水将热量传递出来时，地热能就可以实际形式加以利用了。这些水通常是沿着岩石的断面下渗的天然地下水，少数情况下是人为从地表泵入的水。通过为了采集地热能所钻的孔，这些水会以液体或蒸汽的形式被带到地表。
【2】到目前为止，最丰富的地热能形式介于相对较低的80到180摄氏度的温度。在此温度范围内的热储内循环的水可以提取出足够的热量供居住区、商业区和工业区取暖。目前在法国有20 000间以上的公寓是由温暖的地下水供暖的，这些地下水来自位于巴黎附近叫做巴黎盆地的地质构造的热储。冰岛位于一个被称为是大西洋中脊的火山构造之上。冰岛的首都雷克雅维克完全是用火山热产生的地热能供暖的。
【3】温度高于180摄氏度的地热储集层可用来发电。这类地热储集层主要位于有近期火山活动的区域，以干热的岩石、天然热水或天然蒸汽的形式存在。后两种形式的储集层局限于少数区域，在这些区域，地表水通过地下断层或断裂渗入到被近期的熔岩活动加热的深层岩石。世界上最大的天然蒸汽供应位于加州旧金山以北120公里处的盖沙斯。二十世纪九十年代，那里产出的电能足够满足旧金山半数的需求。当时该电厂已经有三十个年头了，开始显示出发电量下降的迹象，这可能是由于过度的开发所致。到二十世纪九十年代末，加州、犹他州、内华达州和夏威夷约有70个地热发电厂在运转，产生的电能足够满足一百万人的需求。目前有18个国家在利用地热能发电。
【4】要从极干热的岩石中提取热量存在一个更大的难题：岩石需要有裂缝才能让水流通，而且水必须是人工提供的。通过泵入高压水可以将岩石断裂。开发利用此能源的技术的实验正在进行之中。
【5】就像大多数 其它 能源一样，地热能也具有一些环境问题。如果抽取地下热水而又不泵回，地表就会下沉。此外，地热加热的水含有从热岩中溶出的盐分和有毒物质。这些水如果不能被输送回抽取的地方，将会产生处理方面的问题。
【6】地热能对世界能源未来的贡献是难以估量的。地热能在某种意义上讲是不可再生的，因为多数情况下，与热量流经坚硬的岩石到达热储这个极为缓慢的地质作用的更新速度相比，从热储提取热量的速度要快得多。不过，在很多地区(例如加州、夏威夷、菲律宾、日本、墨西哥、非洲的裂谷)，这种能源可能非常可观，它的前景将取决于经济的生产。目前，我们只能有效地利用天然形成的热水或蒸汽形式的地热能。尽管潜能巨大，近期之内地热能可能只能对毗邻用户以及经济状况良好的地区做出重要的局部贡献，就像在加州、新西兰和冰岛地区的情况一样。如果可能的话，地热能估计要到二十一世纪才能对世界的能源预算做出大的贡献。
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