题目内容

I haven't played basketball ________I left university.

A. But
B. due to
C. since

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I'm happy to help you, ______I know you'd do the same for me.

A. But
B. however
C. as

I learned first aid________ I wanted to be prepared for emergencies.

A. Because
B. but
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A. 苯基哌啶类
B. 氨基酮类
C. 吗啡烃类
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既是阿片μ受体拮抗剂,又是K受体激动剂的是( )

A. 吗啡
B. 哌替啶
C. 布托啡诺
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