情景对话。

请根据对话情景， 补全空中所缺部分。每空词数不限。

Morn: Morning, Tom!

Tom:    1   , Mom. I need some things for school. Can you help me, please?

Mom: Sure.

Tom: I need my dictionary.   2   ?

Mom: Er…It's on the bookcase.

Tom: And I    3   my notebooks.

Mom: Are they in the drawer?

Tom: No,     4   .

Mom: Oh, they're on the desk.

Tom: And my watch.

Mom: Is it on the table?

Tom: I don't know. Let me see. Yes,  5   .Thanks, Mom.

能在无生命培养基上生长繁殖的最小的原核细胞型微生物是

A．细菌

B．衣原体

C．支原体

D．立克次体

E．病毒