It is true that the average temperature【16】r______is only about two degrees,

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问题 It is true that the average temperature【16】r______is only about two degrees, but that has been【17】e______to start the glaciers【18】______ (recede) in many parts of the world.
A rise of one degree per generation is a large【19】in______. Nature seldom moves as swiftly as this. We may have been helping her. To a very large【20】______, the temperature of the Earth is determined【21】______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【22】other______bounce back into space. Carbon dioxide in the air is mostly responsible【23】______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【24】re______of oil and coal. This no longer means disaster, for【25】______ (atom) energy has arrived in time to save our civilization from dying through lack of power. [br]

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