Why is it that small children are so energetic?

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问题 Why is it that small children are so energetic?

选项 A、effective
B、vigorous
C、active
D、busy

答案C

解析 effective：有效的；vigorous：精力充沛的；active：活泼的；busy：忙碌的。题中energetic意为“充满活力的”，可知C选项符合题目s要求。

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