Question

In the 1960s Professor Bolin predicted (预测) that the “greenhouse effect”, caused by an increase in the amount of carbon dioxide (CO₂) in the atmosphere, would lead to important changes in the Earth’s climate. At the time his prediction were regarded as science fiction. But it is now gradually agreed that the amount of carbon dioxide in the atmosphere will double from 0.03% to 0.06% in the next 50 years and that temperatures worldwide will rise by 2°C.

Although a temperature rise of 2° may not seem significant, the local effects may be much greater: in polar regions a rise of 10° by 2025 is expected and in Northern Europe a rise of 4°. Indeed the first effects were expected to be felt before the end of the 20th century.

But how does the “greenhouse effect” operate and why should such a tiny proportion (比例) of CO₂ have such a harmful effect? When living creatures breathe out or when things are burned, CO₂ enters the atmosphere. Until recently all of this was absorbed by plants, which converted (转化) it back into oxygen.

However, the balance of nature has been disturbed. In power stations, in factories and in our cars, we are burning more and more fossil fuels (coal, oil and natural gas) and this produces huge quantities of CO₂—18 billion tons of it enter the atmosphere every year. Added to this, the destruction of forests means that less CO₂ can be converted into oxygen by plants. So, the amount of CO₂ in the atmosphere is increasing every year.

1.Which of the following statements is true according to the passage?

A. Only a small portion of the atmosphere consists of carbon dioxide.

B. Professor Bolin’s predictions were taken seriously in the first place.

C. No changes in climate will become noticeable for 50 years or more.

D. The rise in temperature will probably be 2 degrees in every part of the world.

2.The amount of CO₂ in the atmosphere is increasing every year because        .

A. Carbon dioxide is produced when we breathe.

B. Carbon dioxide is produced when we burn things.

C. More forests are destroyed and more fossil fuels are burned.

D. The global temperature keeps rising.

3.The underlined word “operate” in the third paragraph most probably means “       ”.

A. play         B. move

C. manage        D. function

Answer

1.A

2.C

3.D

【解析】

试题分析：文章大意：文章主要讲述了温室效应是如何产生的，提醒人们注意改变行为方式，保护我们的绿色家园。

1.1】A 细节题。根据文章第一段的But it is now gradually agreed that the amount of carbon dioxide in the atmosphere will double from 0.03% to 0.06% in the next 50 years可知人们逐渐认为大气中二氧化碳的数量在今后的50年里将从0.03% 到 0.06%增加一倍。故A正确。

2.C 推理题。根据文章的最后一段In power stations, in factories and in our cars, we are burning more and more fossil fuels (coal, oil and natural gas) and this produces huge quantities of CO2—18 billion tons of it enter the atmosphere every year. Added to this, the destruction of forests means that less CO2 can be converted into oxygen by plants.可知大气中二氧化碳的增加主要是因为森林被砍伐和更多的燃料如：煤、石油和天然气的燃烧。故C正确。

【小题3 】D 词义题。根据文章operate后的When living creatures breathe out or when things are burned, CO2 enters the atmosphere. Until recently all of this was absorbed by plants, which converted (转化) it back into oxygen可知讲述的是温室效应是如何起作用的。A打，踢；B移动；C设法；D起作用。故D正确。

考点：考查生活类短文