单项选择题

Radiant energy is stored as carbon compounds by （）.

A．plants
B．water
C．rock
D．creatures

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单项选择题

A．say
B．speak
C．tell
D．talk

单项选择题

The sun is the source of all of the following EXCEPT（）.

A．gasoline
B．natural gas
C．atomic power
D．animal fat

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