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
All the useful energy at the surface of the earth comes （）

A．directly from the sun
B．from the sun' s activity
C．from energy stored by the sun
D．from radiation of the sun
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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