大学英语四级阅读模拟题及答案
阅读1
空调的危害
Although many of us may feel air-conditioners bring relief from hot,humid or polluted outside air,they po many potential health hazards.Much rearch has looked at how the movement of air inside a clod environment---such as an office building---can spread dia or expo people in the building to harmful chemicals.
One of the more widely publicized dangers is that of Legionnaire’s dia,which was first recognized inthe1970s.This was found to have affected people in buildings with air-conditioning systems in which warmair pumped out of the system’cooling towers was somehow sucked back into the air intake(通风口),in mostcas due to poor design.The warm air,filled with bacteria,was combined with cooled,conditioned air andwas then circulated around various parts of the building. Studies showed that even people outside such buildings were at risk if they walked past air exhaust pipes.
Large air-conditioning systems add water to the air they circulate by means of humidifiers(湿度调节器).
Inolder systems,the water ud for this process is kept in special rervoirs,the bottoms of which providebreeding grounds for bacteria which can find their way into the ventilation (通风)system.The risk to human health from this situation has been highlighted by the fact that the immune systems(免疫系统)of approximately half of workers in air-conditioned office buildings have developed the ability to fight off the organisms found at the bottom of system rervoirs. But chemicals called“biocides”are added to rervoirs to make them germ-free,and they are dangerous in their own right in sufficient quantities,as they often contain compounds strongly linked to cancers.
Finally,it should be pointed out that the artificial climatic environment created by
air-conditioners canalso affect us.In a natural environment,whether indoor or outdoor,there are small variations in temperature and humidity.Indeed,the human body has long been accustomed to the normal changes.In an air-conditioned living or working environment,however,body temperatures remain well under37℃,our normal temperature.This leads to a weakened immune system and thus greater exposure to dias such as colds and flu.
练习题：
Choo correct answers to the question:
1.What do we know about Legionnaire's dia from the passage?
A.It was the most widely concerned office hazard.
B.It can affect people both inside and outside the building.
C.It happens only in air-conditioned office buildings.
D.It does not develop in well-designed buildings.
2.In the old air-conditioned systems,bacteria first develop______.
A.in the rervoirs
B.in the ventilation system
c.in the humidifiers
教师贺卡制作
D.in the air intake
3.The fact that about half of workers developed the ability to fight off the bacteria may__.
诸葛乔
B.help people find an effective way to get rid of the bacteria
D.cau rious dia such as cancers to people
4.The author most probably wants the readers to treat biocides with an attitude of_.
第六套广播体操视频A.caution
5.The last paragraph implies that our immune system can be weakened when_•
A.we live in an artificial climatic environment
B.there are variations in temperature and humidity
C.our body temperatures often remain not high enough
衡阳会战
D.we are often expod to dias such as colds and flu
答案解析：
1.[B]事实细节题。本题主要考査复合句的理解。第2段最后一句表明B是正确选项。选项A中的most和C中的only都太绝对了，文中并未对选项A和C中的相关说法加以这样的限定。选项D也太绝对了，第2段第3句只是说到“大多数情况下是因为空调设计欠佳所致”，并不是说所有设计良好的大厦就不会发生这种情况。
2.[A]事实细节題。本题考查复合句的理解。只要明白第3段第2句这个非限制性定语从句中的the bottoms of which中的which是指上文的rervoirs，问题就不难解决了。
3.[C]事实细节题。本题考查被动语态长句的理解。在第3段第3句中，关键词是highlight，选项C是对原句主谓部分的近义替换。选项A和B在文中皆无提及，选项D是过度使用生物杀灭剂的后果，与本题干的情况无关。
4.[A]观点态度题。第3段最后两句讨论生物杀灭剂的用处，其中最后一句中的but,dangerous和cancers 等词说明作者认为要慎用这种杀灭剂。作者并没对杀灭剂全盘否定，只是说过量使用会引发危险，因此选项D不对。
华帝消毒柜5.[C]推理判断題。本题考查代词的理解。解题的关键在于理解最后一句中的This是指上一句所说的情况。选项A中所说的人造环境不是使免疫系统变弱的必然条件。选项B是保持免疫系统健康的条件。选项D是免疫系统变弱后的影响。
阅读2
泰国大象的生存危机
For centuries,in the countries of south and Southeast Asia the elephant has been an intimate part of the culture,economy and religion,and nowhere more so than in Thailand.Unlike its African cousin,the Asian elephant is easily domesticated(驯化).The rare so-called white elephants have actually lent the authority of kingship to its rulers and until the1920s the national flag was a white elephant on a red background.To the early Western visitors the country's romantic name was“Land of the White Elephant”.
Today,however,the story is very different.Out of work and out of land,the Thai elephant struggles for survival in a nation that no longer needs it.The elephant has found itlf more or less abandoned by previous owners who have moved on to a different economic world and a westernized
society.And while the elephant's problems began many years ago,now it rates a very low national priority.
How this reversal from national icon(圣像)to neglected animal came about is a tale of worning environmental and the changing lives of the Thais themlves.According to Richard Lair,Thailand’s experts on the Asian elephant and author of the report Gone Astray,at the turn of the century there may well have beenas many as100,000domestic elephants in the country.In the north of Thailand alone it was estimated that more than20,000elephants were employed in transport,1,000 of them alone on the road between the cities of Chiang Mai and Chiang Saen.This was at a time when90per cent of Thailand was still forest—a habitat(栖息地)that not only supported the animals but also made them necessary to carry goods and people.Nothing ploughs through den forest better than a massive but sure-footed elephant.
By1950the elephant population had dropped to a still substantial13,397,but today there are probably
nomore than3,800,with another1,350roaming free in the national parks.But now, Thailand’s forest coversonly20per cent of the land.This deforestation(采伐森林)is the central point of the elephant's difficult situation,for it has effectively put the animals out of work. This century,as the road network grew,so the elephant's role as a beast of burden declined.
练习题：
Choo correct answers to the question:
1.What can we know about African elephants from the passage?
A.It is easy to tame them.
B.It is hard to tame them.
C.They are living a better life than Asian elephants.
D.Their fate is quite similar to that of Asian elephants.
2.Thailand was once called“Land of the White Elephant”becau_______.
A.white elephant is rarely en and thus very special
B.white elephant was a national symbol until the1920s
C.white elephant has helped kings to gain the ruling authority
D.this name was so romantic that it was popular among visitors
3.Why is the Thai elephant“out of work”,according to the author?
A.Becau the elephants are no longer uful to their owners.
B.Becau their owners are westernized and neglect them.
C.Becau the government pays little attention to the problem.
D.Becau there are too many elephants and too few jobs.
4.Which of the following statements is true about the elephant population at various times?
A.There were100,000tamed elephants at the turn of the century.
B.20,000elephants were employed in transport in Thailand at the turn of the century.
C.By1950the elephant population in Thailand has been quite small.
D.Today the elephant population is estimated at5,150.
安康的意思5.The passage is most probably from_______.
A.a travel magazine
B.a history book
祝爷爷生日快乐的祝福语C.a rearch report
D.an official announcement
答案解析：
1.[B]事实细节题。本题考查对比处。根据文章第l段第3句：和非洲象不同，亚洲象容易驯养，言下之意就是：非洲象不易驯养。答案中用tame替代原文的domesticate，意思相同。选项A与原文意思正好相反；选项C，D原文根本未提到。
15号库2.[B]推理判断题。根据文章第l段第4句中的“until the1920s the national flag was a white elephant on a red background.”可知当时白象是泰国的国家象征，因此B为正确选项。本题最具干扰性的是选项D，在形式上，选项D与第1段最后一句极为相似，但是，游客这样称呼泰国，原因也是因为白象是泰国的象征，而不只是因为这个名字浪漫，因此，选项D是对原文的曲解；选项A和选项C虽然也来自文章，但不是原因，不能回答所提问题。
