题目内容
阅读理解
A greenhouse 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 gasses in the atmosphere which trap(捕捉) the heat produced by the sun and prevent it from escaping. These gasses are known as “greenhouse gasses”, 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 gasses exist naturally in small amounts in our atmosphere, and without them 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 much of these gasses into the earth's atmosphere by burning large quantities of coal and oil and by cutting down forests. The rapid increase in greenhouse gasses 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 between 1 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 gasses put into the atmosphere before 1960s. Since then, our use of these gasses has greatly increased.
1.“Greenhouse effect” means ________.
[ ]
A.the way in which gasses are used for keeping plants warm
B.a natural course which is to some degree helpful to us
C.the way “greenhouse gasses” trap heat on the earth
D.the whole course in which greenhouse gasses prevent heat
2.If there were no greenhouse effect, ________.
[ ]
A.no plants would grow on our planet
B.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 among the results of our putting too many of the greenhouse gasses into the air?
[ ]
A.The earth's temperature will rise.
B.The earth's temperature will be much lower.
C.The sea level will rise.
D.Large areas of land will be flooded.
4.Which of the following is not true?
[ ]
A.Burning too much coal and oil produces lots of greenhouse gasses.
B.It has become warmer on the earth now than in the past.
C.Gasses put into the atmosphere now will effect the earth years later.
D.The temperature in a greenhouse is as high as that in the atmosphere.
5.This passage mainly deals with ________.
[ ]
A.the concept and harm of greenhouse effect
B.the relation between greenhouse gasses and man
C.the concept and change of greenhouse effect
D.the effect of the rise of the earth's temperature
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