【題目】— I slept for only five hours last night.

— Oh, that’s too bad. Enough sleep is ______ to your health.

A. similar B. harmful

C. friendly D. necessary

【答案】D

【解析】

--我昨天晚上只睡了5個小時。 --哦,太糟糕了,足夠的睡眠對健康來說是必需的。A. similar相似的,B. harmful有害的,C. friendly 友好的, D. necessary 必需的,根據(jù)生活常識可知,睡眠對健康是必需的,故選D。

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