According to the latest research, getting enough sleep is _____to maintaining good health and reducing stress.
A．practicalB．contradictoryC．essentialD．a(chǎn)lternative
C

試題分析：句意：根據(jù)最新的研究，充足的睡眠是維持良好的身體健康和減少應(yīng)力的根本所在。A. practical實(shí)用的；B. contradictory矛盾的；C. essential基本的；D. alternative可替代的。故選C。
考點(diǎn): 考查形容詞的用法。 
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