20. Rapid eye movement sleep is a phase of sleep, characterized by random rapid movement of the eyes, accompanied by low muscle tone throughout the body, and the _______ of the sleeper to dream vividly.
(A) asset
(B) propensity
(C) stance
(D) tranquility
(E) gadget
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快速眼動睡眠是睡眠的一個階段，特徵是眼...
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