9.(09江西) The fact has worried many scientists ______ the earth is becoming warmer and warmer these years.

A. what　　　　　 B. which　　　　　 C. that　　　　　 D. though

8.(09湖南) She is very dear to us. We have been prepared to do _____it takes to save her life.

A. whichever 　　　 　B. however 　　　 　　　C. whatever 　　　 　D. whoever

7.(09四川)Owen wouldn’t eat anything ____________ he cooked it himself

A. until　　　　　 B. since　　　　　　 C. unless　　　 D. while

6.(09湖南)　 ______ the police thought he was the most likely one, since they had no exact proof about it, they could not arrest him.

A. Although 　 　B. As long as　　　 C. If only 　　　 　D. As soon as

5.(09四川)　 -Would you please help me with the box?

-_________

A. Yes, please　　 B. No, please don’t C. With pleasure　 D. My pleasure

4.(09陕西)　 Form their ________ on the top of the TV Tower, visitors can have a better view of the city.

A. stage　　　　　 B. position　　　　 C. condition　　　 D. situation

3.(09山东)-------He says that my new car is a _____of money.

-------Don’t you think those words are just sour grapes?

A. lack　　　　　 B. load　　　　　　 C. question　　　　 D. waste

2.(09四川)In order to find _______ better job, he decided to study _________ second foreign language.

A. the; a　　　　 B. a; a　　　　　　 C. the; the　　　 D. a; the

1.(09陕西)What _____pity that you couldn’t be there to receive _____ prize!

A. a; a　　　　　 B. the; a　　　　　 C. a; the　　　　 D. the; the

35．(16分)两个质量分别为M₁和M₂的劈A和B，高度相同，放在光滑的水平面上，A和B相向的侧面都是相同的光滑的曲面，曲面下端与水平面相切，如图所示，一个质量为m的物块位于劈A的曲面上，距水平面的高度为h. 物块从静止开始滑下，然又滑上劈B的曲面. 试求物块在B上能够达到的最大高度H是多少？

36(20分)、如图所示，是放置在竖直平面内的游戏滑轨的模拟装置,滑轨由四部分粗细均匀的金属杆组成。AB为水平直轨，CPA与BFD圆形轨道的半径分别为R₁=1.0 m和R₂=3.0 m,而倾斜直轨CD的长为L=6 m,　 AB、CD与两圆形轨道相切,其中倾斜直轨CD部分的表面粗糙,且其动摩擦因数为, 轨道其余各部分的表面光滑.一个质量为m=2 kg的滑环(套在滑轨上),从AB的中点E处以v₀=10 m/s的初速度水平向右运动.已知=37°(g取10 m/s²) 试求:

(1)滑环第一次通过O₂的最低点F处时对轨道的压力.

(2)滑环通过O₁最高点A的次数.

(3)滑环克服摩擦力做功所通过的总路程.

2009-2010学年度第一学期