2. 外语
  3. For the last fifty years, the globe has been warming up. It is true that the average temperature【C1】r______is only about two

For the last fifty years, the globe has been warming up. It is true that the average temperature【C1】r______is only about two

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问题     For the last fifty years, the globe has been warming up.
    It is true that the average temperature【C1】r______is only about two degrees, but that has been【C2】e______to start the glaciers【C3】______(recede)in many parts of the world.
    A rise of one degree per generation is a large【C4】in______. Nature seldom moves as swiftly as this. We may have been helping her. To a very large【C5】______, the temperature of the Earth is determined【C6】______the amount of solar heat which the atmosphere can keep.
    The air above us sets like the glass in a greenhouse, trapping many of the heat waves which would【C7】other______bounce back into space. Carbon dioxide in the air is mostly responsible【C8】______the "greenhouse effect" : it is a gas produced by all our countless fires, furnaces(熔炉)and internal combustion engines(内燃机).
    The end of the age of fossil fuels is already in sight: soon in one or two centuries at the roost we will have wasted all the world’s【C9】re______of oil and coal. This no longer means disaster, for【C10】______(atom)energy has arrived in time to save our civilization from dying through lack of power.
【C5】
选项
答案extent
解析 to…extent在某种程度上。
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