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6.物體先做初速度為零的勻加速運動，加速度大小為，當速度達到時，改為以大小為 的加速度做勻減速運動，直至速度為零，在加速和減速過程中物體的位移和所用時間分別為、和、，下列各式成立的是　　　　　　　　　　　　　　　　　

　　 A． B. 　　C. 　　D.

5．一個25kg的小孩從高度為3.0m的滑梯頂端由靜止開始滑下，滑到底端時的速度為2.0m／s。取g＝10m／s²，關(guān)于力對小孩做的功，以下結(jié)果正確的是

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．右圖是一種升降電梯的示意圖，A為載人箱，B為平衡重物，它們的質(zhì)量均為M，上下均有跨過滑輪的鋼索系住，在電動機的牽引下使電梯上下運動．如果電梯中載人的質(zhì)量為m，勻速上升的速度為v，電梯即將到頂層前關(guān)閉電動機，依靠慣性上升h高度后停止，在不計空氣和摩擦阻力的情況下，h為

_A．　　　 B．　 C．　　 D．

3.如圖所示，用光滑的粗鐵絲做成一直角三角形，BC邊水平，AC邊豎直，∠ABC=β.AB邊及AC兩邊上分別套有用細線相連的銅環(huán)(其總長度小于BC邊長)，當它們靜止時，細線跟AB所成的角θ的大小為(　 )

A.θ=β　　　　 B.θ=　　　　 C.θ<β　　　　 D.β<θ<

2．如圖所示，一個小球(視為質(zhì)點)從H=12m高處，由靜止開始通過光滑弧形軌道AB，進入半徑R=4m的豎直圓環(huán)，圓環(huán)軌道部分的動摩擦因數(shù)處處相等，當?shù)竭_環(huán)頂C時，剛好對軌道壓力為零；沿CB滑下后，進入光滑弧形軌道BD，且到達高度為h的D點時速度為零，則h之值可能為(g=10m/s²)　　　　　　　　　　　　

A．10m　　 B．11m　 C．8m　　　 D．9m　　　

1、如圖所示，質(zhì)量相同的兩個帶電粒子P、Q以相同的初速度沿垂直于電場方向射入兩平行板間的勻強電場中，P從兩極板正中央射入，Q從下極板邊緣處射入，它們最后打在同一點(重力不計)，則從開始射入到打到上極板的過程中　

A、 它們運動的時間t_Q = t_P　　　　　

B、 它們所帶電荷量之比q_p : q_Q = 1 : 2　

C、它們的電勢能減少量之比△E_P : △E_Q = 1: 2

　 D、它們的動量增量之比△P_p : △P_Q = 2 : 1

第二節(jié)　 寫作(滿分25分)

最近，你校組織高三學生進行了一場討論。主題是：要不要集中進行晚自習。根據(jù)下圖提供的信息，寫一篇140字左右的英語短文，客觀地介紹一下討論的情況，注意要涵蓋所有要點。

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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.

聽力材料

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!