The total amount of energy received per minute by the whole earth is a great sum, but it is only a tiny fraction of the total en

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问题 The total amount of energy received per minute by the whole earth is a great sum, but it is only a tiny fraction of the total energy radiated by sun.

选项 A、sent in
B、sent for
C、sent out
D、sent up

答案C

解析 radiate辐射,与词组send out同义。send in递进;send for派人去请;send up使……升高。故选C项。
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