3．接通電源，松開紙帶，讓重錘自由下落。

2．把紙帶的一端在重錘上用夾子固定好，另一端穿過計時器限位孔，豎直提起紙帶使重錘停靠在打點計時器附近，紙帶上端用夾子夾住。

1．按如圖裝置把打點計時器安裝在鐵架臺上，用導(dǎo)線把打點計時器與學(xué)生電源連接好。

　 　鐵架臺(帶鐵夾)，打點計時器，學(xué)生電源，導(dǎo)線，帶鐵夾的重綞，紙帶，米尺。

當(dāng)物體自由下落時，只有重力做功，物體的重力勢能和動能互相轉(zhuǎn)化，機械能守恒。若某一時刻物體下落的瞬時速度為v，下落高度為h，則應(yīng)有：，借助打點計時器，測出重物某時刻的下落高度h和該時刻的瞬時速度v，即可驗證機械能是否守恒， 實驗裝置如圖所示。測定第n點的瞬時速度的方法是：測出第n點的相鄰前、后兩段相等時間T內(nèi)下落的距離s_n和s_n+1，由公式 ，或由算出,如圖所示。

驗證機械能守恒定律

第二節(jié)　 書面表達(共1小題；滿分25分)

　　 2008年我國舉辦奧運會后，某中學(xué)生英語學(xué)習(xí)報請你在你居住的城市里做一個調(diào)查，

內(nèi)容是你們那兒人們對國際運動賽事的看法。你做了調(diào)查后發(fā)現(xiàn)：有67%的人認(rèn)為國際運動賽事有利于國家間友善的創(chuàng)立；認(rèn)為如果各國運動員在一起參賽，他們將學(xué)會如何共同相處。但其他的人卻認(rèn)為情況相反：他們認(rèn)為國際運動比賽會鼓勵錯誤的民族自豪感，并導(dǎo)致人們的誤解和怨恨。這兩種看法似乎都有道理。你也談?wù)勀銓Υ说目捶ā?/p>

注：1、詞數(shù)：100-120個；

　　 2、參考詞匯：友善：goodwill;　　 怨恨：hatred

聽力錄音材料

Text 1

　M:　 Good morning, Madam. Can I help you?

W:　 I only bought this refrigerator two days ago and it’s already broken.

M:　 May I see the receipt for it, please?

Text 2

W: Hi, Jack. Have you heard whether Kitty is coming back at four this afternoon ?

M: She was supposed to arrive at five, but she’s coming at four thirty.

Text 3

W: Good morning , sir. What can I do for you ?

M: I’m looking for two pairs of shoes. One pair of 43, and the other-15. One for me, the other for my kid.

W; OK, here you are.

Text 4

M: Adela, how can I improve my listening?

W; Li Hua, you should ask yourself: How often do you listen to English after class ?

M: Not often.

Text 5

W: Tom, it’s too cold. I’m freezing ! It must be the wind that makes it so cold.

M: Me, too, Mary. Let’s go inside. OK ?

W: OK. It’s no fun standing out here, even if the sun is shining.　

Text 6

W: Good afternoon! Singing Training School. Can I help you ?

M: Yes. I’d like to ask about singing training classes.

W: Well. We start classes on March the fourth and we go for five weeks. We meet twice a week.

M: How much does it cost ?

W: $ 150. That’s $15 for each lesson.

M: How much does it cost if I am a member of your club ?

W: It’s half the price.

M: I see.

W: And you can come and put down your name on March the second or the third if you have decided to attend the class.

M: Thank you.

W: You are welcome.

Text 7

W: Hi, Simon. Would you please tell us about one of your adventure travels ?

M: I’d love to. One time I went on a boat trip up a long river in Africa. I stayed on the boat for fifty days ! I never walked on land once in those days, not even for one second.

W: That’s hard to believe.! Simon, can you remember a time when you were really frightened ?

M: Oh yes. On another trip to Africa, it was night and I was being followed by some animals. I could hear the animals but I couldn’t see them . I could not tell if they were dangerous .　

W: My goodness ! I would have been scared to death . What did you do ?

M: I kept running . I thought that if I stopped . the animals would hurt me . I was very happy to see the sun in the morning !

W: Have you ever considered giving up your adventures ?

M: Yes . I realized long ago that I should spend more time with my family , but I still love traveling . I always look forward to exciting experiences but I am sorry for leaving my family .

Text 8

W: Hello, everyone. Please observe the “Fasten your seat-belt” sign at the front of the aircraft. When the light is off, you are free to move about the aircraft. If the light comes on, return to your seat and fasten your seat-belt.

M: What happens if you don’t fasten the seat-belt ?

W: If you don’t fasten it, you might get thrown out of your seat in bad weather. By the way, when the meal is served in a few minutes, please return your seats to the upright position.

M: Why do we have to do it ?

W: If your seat isn’t upright, it will be difficult for the person behind you to eat his meal.

M: Oh, I see.

Text 9

M: Good morning, this is Peace Telephone Company. What can I do for you ?

W: Is that Complaints Department?

M: Yes, it is.

W: Good, I want to complain about the bill I received this month. I can’t believe I’ve made that many phone calls. Are the rates going up ? There must be a mistake in your billing.

M: All right, Madam, tell me your phone number and I’ll check it up for you.

W: My number is 13870877795.

M: 13870877795. Please hold on a moment …Hello.

W: Yes, I’m still here.

M; Well, there seems to be no problem. The bill is correct. You must have overlooked the international call you made to Europe last month.

W: Let me see …Right, I’m sorry, it is my mistake. But it is still very expensive.

M: Well, why not apply for IDS, the International Dial Service. The rates are cheaper. I’m sure you’ll save a lot if you do that.

W: I agree. Thank you very much and sorry for bothering you.

M: That’s all right.

Text 10

　 Hello, everyone. I’m Jim Green. Do you want to know what problems cars have brought to our country ? Listen to this newspaper report I’ve found. There are some interesting facts in it.

　 It says there are more cars on our roads now than at any other time in history. There are millions of possible car buyers here, and car makers are busy making cars for them. However, there are fewer buyers now than in the last few years, and prices are lower. By the year 2020, there will be 480 million cars blocking our roads. That’s almost seven times the number of cars on our roads now.

　 The effect of all these cars will be pollution, which is already a major problem, especially in some of our big cities, where the sky is often a yellow-brown color. There are more road accidents in our country than in other ones. The traffic is not moving now and will only get worse in the future.

貴州省興仁一中2009年高中畢業(yè)班強化訓(xùn)練