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
For mankind, the sun is the source of（）

A．solar activity
B．all heat
C．all food
D．both B and C
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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