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【题目】It’s _____ to keep healthy.

A.necessaryB.impossibleC.carefulD.serious

【答案】A

【解析】

句意:保持健康是必要的。

考查形容词辨析。necessary必要的;impossible不可能的;careful小心的,仔细的;serious严重的,严肃的。根据句意和常识可知,保持身体健康很有必要。故选A

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