阅读理解。

     Our school has a big library. We often go there. Today is Sunday. Lily and I are in the library. In the

library there are some signs on the wall. The signs mean (意思是) different (不同的) things. We know them.

Don't shout in the reading room. Don't drink or eat here. Don't litter (乱扔东西) in the library.

     I see a man smoking in the reading room. I go to him and say, "Sir, you can't smoke here. Look at the sign.

It says 'No smoking'. You can smoke in the smoking room." The man says sorry.

1. Which sign means "Don't litter"?

        A               B                     C              D

2. What are there on the wall of the library?

A. Pictures

B. Maps

C. Signs

D. Photos

3. The man can smoke __________.

A. in the reading room

B. in the smoking room

C. anywhere (任何地方) in the school

D. in the library

4. Where are Lily and I?

A. In the park.

B. At the cinema.

C. In a shop.

D. In the library.

5. In the library __________.

A. you can eat or drink

B. you can smoke

C. you can't talk loudly (大声地)

D. you can litter

如果不等式ax²+bx+c<0 （a≠0）的解集是φ,那么                       （   ）

A．a<0，且b²-4ac>0

B．a<0且b²-4ac≤0　

C．a>0且b²-4ac≤0

D．a>0且b²-4ac>0