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
For mankind, the sun is the source of （）

A．solar activity
B．all heat
C．all food
D．both B and C
单项选择题
What is the main subject of the passage（）

A．Language acquisition in children.
B．Teaching languages to children.
C．How to memorize words.
D．Communicating with infants.
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