9. Which do you enjoy _____ the coming weekend, picnicking or a visit to Shanghai World Expo?

　 A. to spend　　 　B. to spending　 　C. spending　　 　D. on spending

8. The child said that he had _____ the pen on the desk, but I thought he ____ to me.

A. laid; lied　　 B. lain; lied　　 　C. lied; lay　　　 　D. lain; lay

7. Books of this kind ______ popular with the pre-school children.

A. is　　　　　 B. are　　　 　　C. has　　　　 　D. have

6. --Are you satisfied with his reply?

　 --Not at all. It couldn’t have been ______ .

　 A. any worse　　 B. so bad　　 　　C. much better　 D. the worst

5. As a result of the snowstorm, the village was ____ from the outside world for more than a week.

A. cut down　　 B. cut off　　 　　C. cut out　　　 　D. cut up

4. Jimmy is a true hero, ______ always thinks more of others than of himself.

A. he who　　　 B. whom　　 　C. one who　　 　D. who he

3. Tens of thousands of people starved to _____ when the two countries were at war.

A. die　　　　　 B. death　　　 　C. dead　　　　 　D. dying

2. ______ many people’s expectation, he was defeated in the first round.

A. In stead of　　 B. In spite of　　 C. Contrary to　　 D. On account of

Directions: Beneath each of the following sentences there are four choices marked A, B, C and D. Choose the one answer that best completes the sentence.

1. I could hardly believe he ______ have been taken in by such a simple trick.

A. could　　　　 B. should　　 　C. may　　　　 　D. must

38．(8分)[物理-物理3-5]

(1)大量氢原子处于不同能量激发态，发生跃迁时放出三种不同能量的光子，其能量值分别是：1．89eV,10．2eV,12．09eV。跃迁发生前这些原子分布在_______个激发态能级上，其中最高能级的能量值是______eV(基态能量为-13．6eV)。

(2)如图所示，滑块A、C质量均为m，滑块B质量为m。开始时A、B分别以的速度沿光滑水平轨道向固定在右侧的挡板运动，现将C无初速地放在A上，并与A粘合不再分开，此时A与B相距较近，B与挡板相距足够远。若B与挡板碰撞将以原速率反弹，A与B碰撞将粘合在一起。为使B能与挡板碰撞两次，应满足什么关系？