单项选择题

The largest part of the radiant energy directed toward the earth is（）

A．stored by plants
B．turned into fuel
C．absorbed by the earth' s atmosphere
D．used for electric power

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单项选择题
The sun' s energy indirectly provides the earth with（）

A．fuels
B．waterpower
C．light
D．both A and B
单项选择题
Radiant energy is stored as carbon compounds by （）

A．plants
B．rain
C．coal, oil, and natural gas
D．inflammable substances
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