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英语三级练习题21

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Question 66 to 70 are based on the following passage :

It’s generally agreed that the greatest threat facing the world today is the warming of the earth’s

 atmosphere , commonly called global warming or the greenhouse effect . It is the world’s biggest 

problem because it is truly a world-wide problem . It involves everything in the world , from the

 North to the South poles , from the bottom of the ocean to the edge of the atmosphere . We therefore 

obviously need to find a solution to it . But first of all , we need to be clear about what it is that 

causes the greenhouse effect .

Basically , we have been producing too many of the gases which , when they are released into the earth’s 

atmosphere , trap heat , and thus raise its temperature . There are several gases involved , but the main 

ones are carbon dioxide and chlorofluorocarbons—often called CFCs . The carbon dioxide comes from burning

 forests and from burning fossil fuels such as oil and coal . The CFCs are given off by refrigerators and

 air-conditioning systems . Carbon dioxide is to blame for 56% of the greenhouse effect , and CFCs for 23% .

We now dump 24 billion tons of carbon dioxide into the atmosphere every year. If this figure were to double , 

the average global temperature could go up between 1 to 4 degrees C . This may not sound like much , but a two 

degree rise would make the world hotter than it has ever been in human history . Unfortunately , to make matters

 worse , the warming effect may not make itself apparent until it is too late . The temperature of the world has

 risen by more than half a degree this century , and the oceans have risen by at least 10 cms . But just as it 

takes time for a kettle of water to boil , so it may have taken 30 years or so for the ocean to swell . This means 

that the global warming we are experiencing now is only a result of the carbon dioxide and other gases we have 

dumped into the atmosphere up to the 1960s . Since then , our use of fossil fuels has increased rapidly .

 In other words , the damage may have already been done . Temperatures are expected to increase by at least 

1.3 Celsius degrees by 2030 and 3 degrees by the year 2070 .

66. The best title for this text is ________ .

A. Cause and Effect of Global Warming B. Damages Done by Global Warming

C. Global Warming and Industrial Development D. Solution to the Problem of Pollution

67. A contributing factor to the greenhouse effect is _________ .

A. the earth’s atmosphere B. the world climate

C. the forest fire D. the two poles

68. The greenhouse effect we are experiencing now is resulted from _____ .

A. the present environmental pollution B. the poisonous gases produced 30 years ago

C. the development of industry D. the wastes dumped by people

69. The world temperature rise for this century is ______ .

A. 1 to 4 degrees C B. 3 degrees C

C. over half a degree C D. 1.3 degrees C

70. We may infer from this passage that ______ .

A. carbon dioxide and CFCs are equally harmful to the environment

B. global warming is a direct cause for natural disasters

C. the world temperature rise has been going up more quickly as time passes

D. people’s living standard has been on the rise

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英语三级练习题汇总

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