记忆是过去经验在头脑中的保持和重现。
参考答案:对
石决明的主治病证是
A.肝阳眩晕
B.目赤肿痛
C.视物昏糊
D.烦躁失眠
You ______ be hungry already, you had lunch only two hours ago! [ ]
A. wouldn't
B. can't
C. mustn't
D. needn't