While a person is asleep,a part of his brain is still _____

题目

While a person is asleep,a part of his brain is still _____
[A] active [B] awake
并说明原因,

答案

While a person is asleep,a part of his brain is still __active__.
当一个人睡着时,他的大脑的一部分仍然很活跃.
当人进入睡眠时,人的大脑并不停止活动,特别是到深层睡眠时段做梦时,人的大脑活动会尤其频繁.