C the burning of large quantities Of coal and oil.
D the flooding of large areas of the world.
44 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.
45 A small increase in the earths 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】
41. A 42. B 43. C 44. D 45. A
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