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[考博英语]2015考博英语阅读理解模拟练习(一)_考博_旭晨教育

2015 考博英语 阅读理解模拟练习(一)

2015考博考试时间大多为3月,距今还有一个多月,考博考生们应该多抓紧复习分值比较大的考博英语阅读理解,希望考生们多做习题以此熟悉单词和语法、完型。

Recent research has claimed that an excess of positive ions in the aircan

have an ill effect on people's physical or psychological health. What are positive

ions?Well,the air is full of ions,electrically charged particlesand generally

there is a rough balance between the positive and the negative charged. But

sometimes this balance becomes disturbed and a larger proportion of positive ions

are found. This happens naturally before thunderstorm,earthquakes when winds such

as the Mistral,Hamsin or Sharav are blowing in certain countries. Or it can be

caused by a build-up of static electricity indoors from carpets or clothing made

of man-made fibres,or from TV sets,duplicators or computer display screens.

When a large number of positive ions are present in the air many people

experience unpleasant effects such as headaches,fatigue,irritability,and some

particularly sensitive people suffer nausea or even mental disturbance. Animals

are also affected,particularly before earthquakes,snakes have been observed to

come out of hibernation,rats to flee from their burrows,dogs howl and cats jump

about unaccountably. This has led the US Geographical Survey to fund a network of

volunteers to watch animals in an effort to foresee such disasters before they

hit vulnerable areas such as California.

Conversely,when large numbers of negative ions are present,then people have

a feeling of well-being. Natural conditions that produce these large amounts

are near the sea,close to waterfalls or fountains,or in any place where water

is sprayed,or forms a spray. This probably accounts for the beneficial effect

of a holiday by the sea, or in the mountains with tumbling streams or waterfalls.

To increase the supply of negative ions indoors,some scientists recommend the

use of ionisers:small portable machines,which generate negative ions. They

claim that ionisers not only clean and refresh the air but also improve the

health of people sensitive to excess positive ions. Of course,there are the

detractors,other scientists,who dismiss such claims and are skeptical about

negative/positive ion research. Therefore people can only make up their own

minds by observing the effects on themselves,or on others,of a negative rich or

poor environment. After all it is debatable whether depending on seismic

readings to anticipate earthquakes is more effective than watching the cat.

1.What effect does exceeding positive ionization have on some people?

A.They think they are insane.

B.They feel rather bad-tempered and short-fussed.

C.They become violently sick.

D.They are too tired to do anything.

2.In accordance with the passage,static electricity can be caused by___.

A.using home-made electrical goods.

B.wearing clothes made of natural materials.

C.walking on artificial floor coverings.

D.copying TV programs on a computer.

3.A high negative ion count is likely to be found___.

A.near a pound with a water pump.

B.close to a slow-flowing river.

C.high in some barren mountains.

D.by a rotating water sprinkler.

4.What kind of machine can generate negative ions indoors?

A.Ionisers.

B.Air-conditioners.

C.Exhaust-fans

D.Vacuum pumps.

5.Some scientists believe that___.

A.watching animals to anticipate earthquakes is more effective than

depending on seismography.

B.the unusual behavior of animals cannot be trusted.

C.neither watching nor using seismographs is reliable.

D.earthquake

参考答案:BCDAA



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