大学英语三级考试考前辅导练习十三

Part Ⅲ Reading comprehension

Passage 1

A green house is a building made of glass which is used for keeping plants warm when the outside temperature is low. In a similar way there are several gases in the atmosphere which trap the heat produced by the sun and prevent it from escaping. These gases are known as “greenhouse gases”, and the way in which they trap heat in the atmosphere is called the “greenhouse effect”. This is not simply air pollution. Most of the main greenhouse gases exist naturally in small amounts in our atmosphere, and without them the earth would be 30 degrees colder and human life wound not exist. In other words, the greenhouse effect is a natural course which is to some degree helpful to us.

The problem is that in the last century and a half, we have been putting too many of these gases into the earth’s atmosphere by burning large quantities of coal and oil and by cutting down forests. The rapid increase in greenhouse gases is making the world warmer. The world’s temperature has already gone up by half a degree this century, and the sea level has risen by 10 centimetres. If the amount of carbon dioxide in the atmosphere doubles there will probably be a rise in the earth’s temperature of between 1and 4. This may seem a small increase, but it would be enough to cause major changes in geography and agriculture. Large areas of the world would be flooded, and some areas would become dry and unable to produce crops. It is important, too, to consider that there may be a delay of about 30 years in the greenhouse effect. This means that we are probably experiencing only now the effect of the gases put into the atmosphere before the 1960s. Since then, these gases have greatly increased.

1. “ Greenhouse effect” means ___________.

A. The way in which gases are used for keeping plants warm

B. a natural course which is to some degree helpful to us

C. the way “greenhouse gases” trap heat on the earth

D. the whole course in which greenhouse gases prevent heat

2. If there were no greenhouse effect, ________

A. no plants would grow on our planer

B. the earth would be thirty degrees colder

C. man could not live on the earth

D. all of the above answers are correct

3. Which of the following is NOT true?

A. Burning too much coal and oil produces lots of greenhouse gases.

B. It has become warmer on the earth now than in the past.

C. gases put into the atmosphere now will effect the earth years later.

D. the temperature in a greenhouse is as that in the atmosphere.

4. Suppose the earth’s temperature rose by 3 degrees_________.

A. great harm would be done to mankind

B. the sea level would go up by 10 centimetres

C. all the land in the world would be flooded

D. crops would be unable to grow on the earth

5. This passage mainly deals with ____________.

A. The concept and harm of greenhouse effect

B. the relation between greenhouse gases and man

C. the concept and change of greenhouse effect

D. the effect of the rise of the earth’s temperature

Passage2

Do you find getting up in the morning so difficult that it is painful?This might be called laziness,but Dr.Klaitman has a new explanation.He has proved that everyone has a daily energy cycle.

During the hours when you labor through your work,you may say that you're “hot”.That's true.The time of the day when you feel most energetic is when your cycle of body temperature is at its peak.For some people the peak comes during the forenoon.For others it comes in the afternoon or evening.No one has discovered why this is so,but it leads to such familliar monologues(独白)as:“Get up,John!You will be late for work again!”The possible explanation to the trouble is that John is at his temperature and energy peak in the evening.Much family quarrelling ends when husbands and wives realized what these energy cycles mean,and which cycle each member of the family has.

You can't change your energy cycle,but you can learn to make your life fit it better.Habit can help,Dr.Klaitman believes.Maybe you're sleepy in the evening but feel you must stay up late anyway.Counteract(阻碍)your cycle to some extent by habitually staying up later than you want to.If your energy is low in the morning but you have an important job to do early in the day, rise before your usual hour.This won't change your cycle,but you’ll get up steam and work better at your low point.

1.If a person finds getting up early difficult,a problem most probably is­­­­­­­______.

A.he is a lazy person

B.he refuses to follow his own energy cycle

C.he is not sure when his energy is low

D.he is at his peak in the afternoon or evening

2.Which of the following may lead to family quarrels according to the passage?