醋酸地塞米松的化学名（）.

A．17α-甲基-17β-羟基雄甾-4-烯-3-酮 

B．雌甾-1，3，5（10）-三烯-3，17β-二醇 

C．17β-羟基-19-去甲-17α-孕甾-4-烯-20-炔3-酮 

D．16α-甲基-11β，17α，21-三羟基-9α-氟孕甾-1，4-二烯-3，20-二酮-21-醋酸酯 

E．17α-羟基-19-去甲-17α-孕甾-4-烯-20-炔3-酮

补全对话。

A: Hello! 28361579.

B: Is 1              Mr. Jones?

A: Sorry, he 2              in at the moment. He left home a few minutes 3             .

B: 4              a pity! Will he come back soon?

A: I'm not sure. Can I 5              a message for him?

B: It's very 6              of you. There will 7              a meeting at 2:00 tomorrow afternoon.

    Please tell him to come 8              time.

A: I certainly will. I'll tell him as 9              as he comes back.

B: Thanks a lot. Good-bye!

A: You're 10             .