Question

A green house is a building made of glass which is used for keeping warm when the outside temperature is low. In a similar way there are several gases in the atmosphere (mixture of gases that surround the earth) 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 would 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 forest. 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 I and 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, our use of these gases has greatly increased.
【小題1】 According to the passage, we can know “greenhouse effect” means_______.  

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

B．a(chǎn) natural course that is to a certain degree useful to us

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

D．the whole course in which greenhouse gases prevent heat

【小題2】 If there were no greenhouse effect,_______.

A．a(chǎn)ll plants would not grow on our planet

B．soil would reduce the temperature by 30 degrees

C．man would breathe the cleaner air

D．people couldn’t live in the earth

【小題3】 Which of the following is not true?

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

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

C．Gases put into the atmosphere now will affect the earth years later.

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

【小題4】 Suppose the earth’s temperature rose by 3 degrees, _______. 

A．great harm will be done to mankind

B．the sea level would go up by 10 centimeters

C．a(chǎn)ll the land in the world would be flooded

D．crops would be unable to grow on the earth

【小題5】 This passage mainly deals with ________.

A．the concept (概念) and the harm of the greenhouse

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

Answer 1

【小題1】B
【小題2】B
【小題3】D
【小題4】D
【小題5】A

解析【小題1】B 從第一段最后一句” the greenhouse effect is a natural course which is to some degree helpful to us.” 可知,答案選B。
【小題2】B 根據(jù)常理推斷，沒有溫室氣體的話，地球溫度會(huì)下降30°，大部分植物都不會(huì)生存下去，A太絕對(duì)，排除。C項(xiàng)不正確，溫室氣體不是空氣污染；D項(xiàng)應(yīng)該是on the earth.沒有溫室氣體的話，地球上就不會(huì)有人類，也就無所謂“人們不能居住在地球上”這一說。
【小題3】D 正誤題比較簡單，可以用排除法做。大量燃燒煤炭和石油會(huì)產(chǎn)生大量的二氧化碳等溫室氣體，A正確；in the last century and a half，人們向大氣層輸送了太多的溫室氣體，導(dǎo)致現(xiàn)在氣候的變暖，B正確；現(xiàn)在排放的氣體會(huì)對(duì)以后的環(huán)境造成影響，C正確；故選D。
【小題4】D 用排除法，文章提到溫度升高會(huì)對(duì)地理和農(nóng)業(yè)造成大的影響，排除A項(xiàng)；B項(xiàng)是概念混淆，文章只提到海平面上升了10厘米，但并不意味著每次都是正好上升10厘米；根據(jù)“some areas would become dry and unable to produce crops.”排除C項(xiàng)；故選D項(xiàng)。
【小題5】A 主旨大意題。文章主要介紹溫室氣體和溫室效應(yīng)的概念，并提到溫室效應(yīng)的對(duì)環(huán)境造成和將造成的影響。A項(xiàng)概括得最全面。