25. - Daming is going to have a good rest when he _________ the exam.
- So is Lingling.
A. will finish B. finishes C. finished D. is finishing
24. - _________ do you want to be when you grow up?
- A teacher. Because I love children very much.
A. What B. Why C. How D. When
23. - Must ! stay here with you?
- No, you _________. Just do your own business.
A. mustn't B. needn't C. can't D. may not
22. - Where's our library?
- It's _________ the right side of the teacher's office.
A. at B. for C. on D. in
从下面各题所给的A、B、C、D四个选项中,选择可以填入空白处的最佳选项。
21. My mother is a manager, and _________ works in Lenovo in Zhongguancun.
A. she B. he C. her D. him
请根据听到的内容和提示词语,将所缺的关键信息填写在答题卡的相应位置上。
Telephone Message
Who calls: John Brown
Where to go: 17. ___________________________
Whom to visit: 18. John's_____________________
How long to stay: 19. ___________________________
When to leave: 20. ___________________________
知识运用(共27分)
5. When does the first class begin?
A. At 8:30. B. At 9:30. C. At 2:30.
6. How many classes are there in the evening?
A. 0. B. 1. C. 2.
现在请听一段对话,完成第7至第8小题。
7. Who will go to see the doctor?
A. Mike. B. Alice. C. Betty.
8. When will they go to see the film?
A. On Friday. B. On Saturday. C. On Sunday.
现在请听一段对话,完成第9至第10小题。
9. Where are they talking?
A. At home. B. At school. C. In the street.
10. What should they do first?
A. Follow the teacher. B. Wash the hands. C. Listen and watch.
现在请听一段对话,完成第11至第13小题。
11. What was the boy doing in the park?
A. Riding a bike. B. Playing with a cat. C. Walking the dogs.
12. The boy hurt his head yesterday because
A. he fell off the bike B. the dogs ran after him C. he had a car accident
13. The boy's mother
A. hurt her arm B. stayed in hospital C. was all right
现在请听一段独白,完成第14至第16小题。
14. Which part is the most difficult one in the program?
A. Searching. B. Collecting. C. Carrying.
15. What color cans are for waste?
A. Pink. B. Blue. C. White.
16. What you hear might be
A. an advertisement B. an introduction C. a piece of news
1.
2.
3.
4.
20.(12分)一束初速不计的电子流在经U =5000V的加速电压加速后,在距两极板等距处垂直进入平行板间的匀强电场,如图所示,若板间距离d =1.0cm,板长l =5.0cm,那么,要使电子能从平行板间飞出,两个极板上最多能加多大电压?
附加题(10分)如图所示,Q为固定的正点电荷,A、B两点在Q的正上方和 Q相距分别为 h和0.25 h,将另一点电荷从 A点由静止释放,运动到B点时速度正好又变为零。若此电荷在A点处的加速度大小为3g/4,静电力常量为K, 试求:
(1)此电荷在B点处的加速度。
(2)A、B两点间的电势差(用Q和h、K表示)
19.(10分)两个质量均为m=2×10-6kg的小球,悬于长l=60cm的细丝线上.丝线的另一点固定于同一点O.当使两球带上等量同种电荷后,两球互相排斥使两丝线间形成α=90°的夹角(图1-28).求每个小球的带电量.
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