6.物体先做初速度为零的匀加速运动，加速度大小为，当速度达到时，改为以大小为 的加速度做匀减速运动，直至速度为零，在加速和减速过程中物体的位移和所用时间分别为、和、，下列各式成立的是　　　　　　　　　　　　　　　　　

　　 A． B. 　　C. 　　D.

5．一个25kg的小孩从高度为3.0m的滑梯顶端由静止开始滑下，滑到底端时的速度为2.0m／s。取g＝10m／s²，关于力对小孩做的功，以下结果正确的是

A．重力做功500J　　　 B支持力做功50J　 C合外力做功50J　　　 D阻力做功500J　　

4．右图是一种升降电梯的示意图，A为载人箱，B为平衡重物，它们的质量均为M，上下均有跨过滑轮的钢索系住，在电动机的牵引下使电梯上下运动．如果电梯中载人的质量为m，匀速上升的速度为v，电梯即将到顶层前关闭电动机，依靠惯性上升h高度后停止，在不计空气和摩擦阻力的情况下，h为

_A．　　　 B．　 C．　　 D．

3.如图所示，用光滑的粗铁丝做成一直角三角形，BC边水平，AC边竖直，∠ABC=β.AB边及AC两边上分别套有用细线相连的铜环(其总长度小于BC边长)，当它们静止时，细线跟AB所成的角θ的大小为(　 )

A.θ=β　　　　 B.θ=　　　　 C.θ<β　　　　 D.β<θ<

2．如图所示，一个小球(视为质点)从H=12m高处，由静止开始通过光滑弧形轨道AB，进入半径R=4m的竖直圆环，圆环轨道部分的动摩擦因数处处相等，当到达环顶C时，刚好对轨道压力为零；沿CB滑下后，进入光滑弧形轨道BD，且到达高度为h的D点时速度为零，则h之值可能为(g=10m/s²)　　　　　　　　　　　　

A．10m　　 B．11m　 C．8m　　　 D．9m　　　

1、如图所示，质量相同的两个带电粒子P、Q以相同的初速度沿垂直于电场方向射入两平行板间的匀强电场中，P从两极板正中央射入，Q从下极板边缘处射入，它们最后打在同一点(重力不计)，则从开始射入到打到上极板的过程中　

A、 它们运动的时间t_Q = t_P　　　　　

B、 它们所带电荷量之比q_p : q_Q = 1 : 2　

C、它们的电势能减少量之比△E_P : △E_Q = 1: 2

　 D、它们的动量增量之比△P_p : △P_Q = 2 : 1

第二节　 写作(满分25分)

最近，你校组织高三学生进行了一场讨论。主题是：要不要集中进行晚自习。根据下图提供的信息，写一篇140字左右的英语短文，客观地介绍一下讨论的情况，注意要涵盖所有要点。

_______________________________________________________________________________

_______________________________________________________________________________

_______________________________________________________________________________

One possible version:

　　 Recently there was a heated discussion among Senior 3 students in our school. The students were questioned whether they were willing to have the evening self-study at school or not. Here is the result according to the survey.

　　 60 percent of the students think it’s a good idea to have the evening self-study at school. They think they can do better in their study with the help of the teachers. Also, they can concentrate on their lessons better in the classroom and with company of their fellow classmates.

　　 There are 25 percent of the students who think they prefer to study at home. They suppose that they may get disturbed by others and there are possible dangers on their way home alone.

　　 At the same time, still 15 percent of the students don’t have a clear answer to the question. They say they will go to school to have evening self-study if they are asked to, but they promise they can also do well at home.

听力材料

Text 1

M：Tomorrow is 14th. I still have no idea what gift I should buy for Donald?

W：Emm_… what about a skateboard? School boys love it, I think.

Text 2

M：Hurry up! It’s already 8:25.

W：No hurry! It takes only 20 minutes to get to the station and the train doesn’t leave until 9:15.

Text 3

M：Hi, Helen. I’ve got two film tickets. Would you like to go with me tonight?

W：Oh, I’m sorry. I’d planned to stay at home, but just now I was told to attend an important meeting this evening.

Text 4

M：What’s Susan like?

W：She’s nice. She has a sense of humor. She works for an advertising agency. And on weekends she likes to go swimming.

Text 5

M：Hi, I’m told that Professor Jordan is coming back this weekend.

W：You know, he is the last person I want to see. I’m still working on the project he assigned to me before his leaving.

Text 6

W：Excuse me, Mr. Clinton. I’m wondering if I can ask your advice about my school paper.

M：Oh, you paper! Why not drop by my house and we can talk about it?

W：Great! But when?

M：You see, your class ends at 3:00. Well_… stop over on your way home from school then. All right?

W：Oh, yes. Thank you very much.

Text 7

M：Everyone seems to be on a diet nowadays. Have you noticed that?

W：Everyone seems to talk about that, especially girls.

M：A friend of mine is on sweet potato diet. He eats a sweet potato for breakfast, a sweet potato for lunch and another one for supper.

W：That’s bad for his health! Has he lost any weight?

M：Yes, but he didn’t last long. One day he felt sick and was sent to hospital.

W：I’m sorry to hear that. I think if you want to lose weight, you should not eat too much but you have to eat all kinds of food, vegetables and fruits, and you should also do more exercises.

M：I can’t agree with you any more!

Text 8

W：Sam, is the baby with you? He’s not in the garden.

M：He’s not with me. Maybe he’s upstairs.

W：Please go and see. He’s too quiet.

M：OK. I’ll go and have a look. Oh, Mary, he’s not in the bedroom !!

W：My God! Where’s he then?

M：Oh, my boy_… he’s here! In the washroom!

W：What’s he doing in the washroom?

M：Woops! He’s cleaning his shoes with your toothbrush!

Text 9

M：Mary, you say you’re a marketing manager now? We all thought you’d make a good banker. You were so careful with your money when you were at school.

W：I know, but that’s only because I didn’t have any! No, you’re right. I did go into banking for about six months, but I found it boring.

M：Boring?

W：You know, working with bits of paper the whole time! I quit and got a job as a sales-woman.

I’m now working for a company, selling land. It gets me out of office and I do spend most of my time dealing with people. How about you?

M：I’m busy doing my doctor’s degree. I hope I can settle down and get a job soon.

W：Of course you will. Do you still see anyone from school? Whatever happened to Andy and Lucy?

M：Oh, they’ve gone back to Canada.

Text 10

　　 Good morning, ladies and gentlemen. Today is my turn to bring you something new-my Mexican cheese pie. Hope you’ll like it. Now, let’s start. First, butter the bottom of a round baking dish. Then, put flour around the bottom. Let it come up the sides of the dish, too. Next, we need one large tomato, one small can of peppers, and one onion. Cut them into pieces and put them on the flour. After that, beat together 3 eggs, 1 teaspoon of salt, 1/2 teaspoon of baking powder, and 1/2 cup of milk. Then, one cup of cheese. Mix them together into the dish. Finally, put the dish into the oven .Bake the cheese pie for 45 minutes at 350 degrees. All you can do now is wait! Do remember that you will need to let it cool for half an hour after you take it out of the oven. Please enjoy it!