3．接通电源，松开纸带，让重锤自由下落。

2．把纸带的一端在重锤上用夹子固定好，另一端穿过计时器限位孔，竖直提起纸带使重锤停靠在打点计时器附近，纸带上端用夹子夹住。

1．按如图装置把打点计时器安装在铁架台上，用导线把打点计时器与学生电源连接好。

　 　铁架台(带铁夹)，打点计时器，学生电源，导线，带铁夹的重缍，纸带，米尺。

当物体自由下落时，只有重力做功，物体的重力势能和动能互相转化，机械能守恒。若某一时刻物体下落的瞬时速度为v，下落高度为h，则应有：，借助打点计时器，测出重物某时刻的下落高度h和该时刻的瞬时速度v，即可验证机械能是否守恒， 实验装置如图所示。测定第n点的瞬时速度的方法是：测出第n点的相邻前、后两段相等时间T内下落的距离s_n和s_n+1，由公式 ，或由算出,如图所示。

验证机械能守恒定律

第二节　 书面表达(共1小题；满分25分)

　　 2008年我国举办奥运会后，某中学生英语学习报请你在你居住的城市里做一个调查，

内容是你们那儿人们对国际运动赛事的看法。你做了调查后发现：有67%的人认为国际运动赛事有利于国家间友善的创立；认为如果各国运动员在一起参赛，他们将学会如何共同相处。但其他的人却认为情况相反：他们认为国际运动比赛会鼓励错误的民族自豪感，并导致人们的误解和怨恨。这两种看法似乎都有道理。你也谈谈你对此的看法。

注：1、词数：100-120个；

　　 2、参考词汇：友善：goodwill;　　 怨恨：hatred

听力录音材料

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.

贵州省兴仁一中2009年高中毕业班强化训练