Greenhouse Effect
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 gases in the atmosphere which trap the heat generated 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 like photochemical smog (光化学烟雾), for example. Most of the main greenhouse gases occur naturally in small amounts in our atmosphere, and without them the earth would be thirty degrees colder and human life would not exist. In other words, the greenhouse effect is a natural process which is to some extent beneficial to us. 1 According to the passage, a greenhouse is built to
A keep the plants warm.
B prevent air pollution.
C stop the greenhouse effect.
D produce useful gases.
2 Without the greenhouse gases, the earth would
A become warmer.
B be much colder.
C move more slowly.
D move quickly.
3 A major cause of the increase in the greenhouse gases is
A the burning of trees and crops.
B the building of many greenhouses.
C the burning of large quantities Of coal and oil.
D the flooding of large areas of the world.
4 According to the passage, chlorofluorocarbon gases differ from carbon dioxide in that
A they are more useful.
B they are much heavier.
C they are more efficient in making the' world colder.
D they are more effective in catching the heat from the sun.
5 A small increase in the earth's temperature may bring about
A a decline in agriculture.
B a drop of the sea level.
C the death of all animals.
D a delay in the greenhouse effect.
【参考答案】
1. A 2. B 3. C 4. D 5. A
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