超过有效期的药品是()
A.假药
B.劣药
C.质量不好的合格药品
D.中成药
E.进口药
参考答案:B
She longed for a pleasant trip in the summer, while her parents desired that she_______ at home, preparing for the coming exam..
A.stay
B.stays
C.must stay
D.would stay
简述人睡眠的阶段。