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

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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
单项选择题
The underlined word which refers to （）

A．their ability
B．reading vocabulary
C．idiomatic expression
D．learning process
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