用 a, an, the, some, any填空。

1.  I have ______ alarm clock.

2.  The books are on______desk.

3.  Look at______plant.  It's very nice.

4.  I need______ID card.

5.  I can see______ photo on the wall.

6.  Can I ask you  ______ questions?

7.  We don't have______ CDs.

8.  ______ keys are in the drawer.

9.  I have ______friends.

10.  Are there______boys in the classroom?

以下对病毒的描述不正确的是（）

A.细胞内寄生

B.属细胞型微生物

C.无复杂细胞结构

D.含DNA或RNA

E.体积微小