补全对话(每空一句)。

Becky: Would you like to see a film?

Lily: Certainly. I'd love to. __1__

Becky: Big Daddy.

Lily: Great! __2__ 

Becky: I have three tickets. One is for myself. The other two are for you and your sister, Lucy.

Lily: Thank your very much.__3__ 

Becky: It'll start at 4:10 this afternoon.

Lily: __4__ 

Becky: The one near East Street Hospital.

Lily: Er. . .__5__ 

Becky: By bike.

Lily: All right.

厅堂平行墙面间易产生的声学缺陷是（）。

A.回声

B.颤动回声

C.声聚焦

D.声染色