情景交际。

    根据对话内容，从对话后的选项中选出能填入空白处的最佳选项，选项中有两项多

余选项。

A: Advance Reservations. Can I help you?

B:          1        

A: Yes, we do have a single room available for those dates.

B: What is the rate, please?

A: The current rate is $ 50 per night.

B:         2        

A: For $ 50 you'll have a radio, a color television, a telephone and a major international newspaper delivered to your room everyday.

B: That sounds not bad at all. I'll take it.

A:         3        

B: Yes, it is Charlson.

A: How do you spell it, please?

B: It's C-H-A-R-L-S-O-N.

A: C-H-A-R-L-S-O-N.         4        

B: (010) 888-1000. By the way, I'd like a quiet room away from the street if that is possible.

A:         5         OK. We look forward do your visit.

B: Thank you and good-bye.

A: Good-bye.

属于双环二萜类化合物的是( )

A．维生素
B．银杏内酯
C．紫杉醇
D．青蒿素
E．冰片