What is the situation of your brain during the sleep before an exam?A.It is deeply relaxed

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What is the situation of your brain during the sleep before an exam?

A.It is deeply relaxed.

B.It feels nervous.

C.It is restless and tired.

D.It keeps working.

请帮忙给出正确答案和分析,谢谢!

热搜:a是b的充分条件,b是a的必要条件吗