题目内容

According to the latest research, getting enough sleep is _____to maintaining good health and reducing stress.
A．practicalB．contradictoryC．essentialD．alternative
C

试题分析：句意：根据最新的研究，充足的睡眠是维持良好的身体健康和减少应力的根本所在。A. practical实用的；B. contradictory矛盾的；C. essential基本的；D. alternative可替代的。故选C。
考点: 考查形容词的用法。 
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