A．吗啡喃结构 B．苯吗喃结构
C．哌啶结构 D．氨基酮结构
E．环己基胺结构
盐酸美沙酮含有
A．
B．
C．
D．
E．

A．He played soccer when he was very young.B．He was the son of Pele.C．His son also played soccer.D．lie played soccer because of Pele. 点击查看答案

听力原文：W: Could you tell me the starting time for both concerts?M: The first begins at 7pm and it lasts two hours and fifteen minutes. The second follows immediately after the first.At what approximate time does the second show start?(13)A．At 7:00 pm.B．At 8:15 pm.C．At 9:00 pm.D．At 9:15 pm.

A.
At
B.At
C.
B．At
D.
C．At
E.
D．At
F.

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