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

A．Experiment.
B．Idea.
C．Activity.
D．Accomplishment.
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