基本语法

A: Excuse me,sir ？Where is the nearest hotel ？

B:   1  . You  may  ask  that  policeman  over there.

A: Thank you all the same.    

(The man goes to the policeman. )

A: Excuse me,   2  ？

C: No. there isn't a hotel near here ，but there is one near the Bank of China.

A:   3  ？

C: It's about two kilometers away.

A:   4  ？

C: You'd better take a taxi ，because it's so late and there aren't any buses now.

A:   5  .

C: You're welcome.

下列被称之为生长素的是（）

A.吲哚乙酸

B.萘乙酸

C.2，4－D

D.乙烯