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
The underlined word reckoned is closest in meaning to which of the following（）

A．Suspected.
B．Estimated.
C．Proved.
D．Sai
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