7. －Congratulations to you ! I hear you got the first place in the English Speech Contest.

－_______ .

A. Don’t mention it. I think that’s only me past.　 B. Thanks. But I think I could have done better.　　 C. There’s nothing to cheer for.　　　　　　　　 D. No, no. It’s a piece of cake.

6. ______ the Atlantic Ocean crosses the equator, the trade winds cause a flow of water to the west.

A. That　　　　　 B. When　　　　　 C. Where　　　　　　 D. Though

5. ______ that the South African writer John Coetzee won the Nobel Prize in Literature for 2003.

　A. They’er reported　 B. He’s reported　　 C. We’er reported　　　 D. It’s reported

4. -You've made great progress in your studies of English, haven't you?

-Yes, but much 　　　　.

A. remains to do　　　　　　　　　 　B. is remained to do

C. remains to be done　　　　　　　　 D. is remained to be done

3. ______ is known to us all is that China has launched Shenzhou V spaceship successfully.

A. That　 　　　　B. What　　　　　　　 C. It　　　　　　　 D. As

2．He hasn't come yet.What do you consider _______ to him？

A．happens　　　　 B．has happened　　　 C．happening　　　 D．to happen

1. Unfortunately, when I dropped in, Doctor Li _____ for Beijing to join in the fight again H1N1, so we only had time for a few words.

　A. just left　　　　　 　B. has just left　　 　　　 C. is just leaving　 　　D. was just leaving

19．(本题满分12分)已知二次函数和一次函数其中a,b,c且满足a>b>c,f(1)=0.

(Ⅰ)证明函数f(x)与g(x)得图像交于不同的两点A，B；

(Ⅱ)若函数F(x)=f(x)-g(x)在[2,3]上的最小值为9，最大值为21，求实数a,b的值.

18. (本题满分12分)已知函数，．

(Ⅰ)讨论函数的单调区间；

(Ⅱ)设函数在区间内是减函数，求的取值范围．

17. (本题满分12分)画出满足约束条件所表示的平面区域，并求3x+5y的最大和最小值.