– Must I get up early tomorrow morning?

– No, _________.

A．you mustn’t

B．I don’t think you have to

C．you can’t

D．you need

麝香具有特异强烈香气的成分是()

A．麝香醇

B．麝香酮

C．麝吡啶

D．雄甾烷

E．挥发油