According to the latest research, getting enough sleep is _____ to maintaining good health and reducing stress.
A．essentialB．promisingC．specialD．sensible
A
本題考查形容詞辨析。句意：根據(jù)最新的研究，得到足夠的睡眠是對保持身體健康和減少壓力都是必不可少的。essential必要的,不可缺的。
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