生大黄功效是（）
A.泻下力缓
B.清上焦火热
C.偏于活血
D.善止血
E.泻下力强
参考答案：E
— Is it in your room?
— ___________________[ ]
A. Yes, it isn't.
B. No, it isn't.
C. No, it is.
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