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

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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

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

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