7. _____ on May Day, the Shanghai Expo has attracted tens of thousands of visitors around the

world every day.

A. Having opened　　 B. Opened　　 C. Opening　　 D. To open

6. With the moonlight keeping them ________, the tourists climbed over the mountain without a guide.

A. approach　 B. silence　　　 C. secret　　 D. company

5. Recently I was frustrated that my essay was rejected my a newspaper. ________, I had my wallet picked on the bus on the way home.

A. To be honest　 B. To make matters worse　 C. To tell you the truth　 D. Believe it or not

4. Will you see to ________ that you will take good care of my car while using it? A. this　　 　　 B. it　　　 C. that　　　 D. him

3. _____ every day, the Internet provides readers with the latest news from all corners of the

world.

A. Update　　 B. To update　　 C. Updating　　 D. Updated

2. During _______ trip to Yunnan, Premier Wen Jiabao stressed ______importance of water conservation projects and promised more government support.

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

第一节　　 单项填空(共15小题；每小题1分，满分15分)

从A、B、C、D四个选项中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。

1. ---Don’t you feel cold, Tim? You wear such a jacket in a day at -5℃. ---___________. I’m boiling. A. No worry　　 B. Take it easy　　　　　 C. Not in the least　　 D. That’s OK

19、如图所示，两块完全相同的木块A与B并排放在光滑的水平桌面上。A、B的质量均为0.4kg，一颗质量0.1kg的子弹以140m/s的水平速度从左边飞来，射穿A后射进B并留在B中，子弹射穿A的过程中，A与B始终并排挨着，测得A、B落地点距桌边的水平距离之比为1:2，求：

(1)子弹射穿A的过程中产生的内能E_A；

(2)子弹射进B的过程中产生的内能E_B。(g取10m/s²)

18、(10分)为确定爱因斯坦的质能方程的正确性，设计了如下实验：用动能为0MeV的质子轰击静止的锂核，生成两个粒子，测得两个粒子的动能之和为MeV，已知质子、粒子、锂粒子的质量分别取、、，求：

(1)写出该反应方程。

(2)通过计算说明正确。(1u = 1.6606×10^-27㎏)

17、(10分)如图所示，一根柔软的弹性绳子右端固定，左端自由，A、B、C、D……为绳上等间隔的点，点间间隔为50cm，现用手拉着绳子的端点A使其上下振动，若A点开始向上，经0.1秒第一次达到最大位

移，C点恰好开始振动，则　

(1)绳子形成的向右传播的横波速度

为多大？　　

(2)从A开始振动，经多长时间J点

第一次向下达到最大位移？