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

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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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