补全对话。

A: I had a little      1       an hour ago.

B: Oh? What     2    ?

A: My bag dropped on the ground       3       I was riding along the street.

B: Did you     4     it?

A: No. A boy in Class Two    5     it    6     when he was walking     7     .He     8       it up and gave it

back to me.

B: How      9      he is! You were      10     .

1.__________ 2.___________ 3.___________4.__________ 5.___________

6.___________7.__________ 8.___________ 9.___________10.__________

如图表明细胞膜具有的功能是（）

A.运输物质

B.保护细胞内部结构

C.传递信息

D.以上都不正确