有两根长直导线a、b互相平行放置，图8所示为垂直于导线的截面图。在图示的平面内，O点为两根导线连线的中点，M、N为两根导线附近的两点，它们在两导线的中垂线上，且与O点的距离相等。若两导线中通有大小相等、方向相同的恒定电流I，则关于线段M N上各点的磁感应强度的说法中正确的是 ( )
D. 在线段M N上只有一点的磁感应强度为零
图6中A是一底边宽为L的闭合线框，其电阻为R。现使线框以恒定的速度v沿x轴向右运动，并穿过图中所示的宽度为d的匀强磁场区域，已知L< d，且在运动过程中线框平面始终与磁场方向垂直。若以x轴正方向作为力的正方向，线框从图6所示位置开始运动的时刻作为时间的零点，则在图7所示的图像中，可能正确反映上述过程中磁场对线框的作用力F 随时间t变化情况的是( )
图4是用电流传感器(相当于电流表，其电阻可以忽略不计)研究自感现象的实验电路，图中两个电阻的阻值均为R，L是一个自感系数足够大的自感线圈，其直流电阻值也为R。图5是某同学画出的在t0时刻开关S切换前后，通过传感器的电流随时间变化的图像。关于这些图像，下列说法中正确的是( )
某小型水电站的电能输送示意图如图2所示，发电机通过升压变压器T1和降压变压器T2向用户供电。已知输电线的总电阻为R，降压变压器T2的原、副线圈匝数之比为4∶1，降压变压器副线圈两端交变电压u＝220
sin100πt V，降压变压器的副线圈与阻值R0=11Ω的电阻组成闭合电路。若将变压器视为理想变压器，则下列说法中正确的是(
)
使两个完全相同的金属小球(均可视为点电荷)分别带上-3Q和+5Q的电荷后，将它们固定在相距为a的两点，它们之间库仑力的大小为F1。现用绝缘工具使两小球相互接触后，再将它们固定在相距为2a的两点，它们之间库仑力的大小为F2。则F1与F2之比为( )第二节 书面表达(满分30分)
近期我市对“城市无车日”开展讨论，市民此议论纷纷，褒贬不一。请你根据下表提示，用英语给“China Dairy”写一篇短文。
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赞成理由 |
反对理由 |
你的观点 |
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1.节省能源 2.保护环境 3.减少交通事故 |
1.上下班浪费时间 2.影响生活质量 3.影响国家税收 |
？ |
注意：
1．不要逐句翻译，可适当发挥，以使行文连贯；2．词数：100左右。
3．开头已给出，其部分不计入总词数内。
D
ear editor
Recently, we’ve had a discussion on whether it’s acceptable to have a car-free day in our city.
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英语听力模拟试题录音原稿
Text 1
M: Is this Bus 316? I want to go to the theater.
W: Yes, but it doesn’t go to the theater. You’ll have to cross the street and take the No. 360 there.
Text 2
W: Good evening, sir. There is a table for two over there. This way, please.
M: Thank you. Could I see the menu, please?
Text 3
W: I hear Bill was fired by his boss the other day.
M: Oh, yes, he was quite sick and usually got to work late.
W: Oh, no. It wasn’t that. He made a big mistake in last week’s deal with the computer company.
Text 4
W: Do you think the Celtics will win the NBA title tonight?
M: I don’t think so. They are too tired after several games.
W: You wanna bet?
M: Yeah? How much do you wanna bet?
W: Let’s make it 50 dollars!
M: Deal. I’ll go for it.
Text 5
M: Can you type?
W: Yes, about eighty words a minute. I have been working as a typist for fifteen years.
M: That’s great. I can’t type more than forty five.
Text 6
M: Look, Jenny. I don’t understand what’s going on. You said your sister was arriving at 7:30 p.m. It’s 8:30 now.
W: I’m sorry, Mike. I don’t understand either. Here’s Helena’s telegram. Have a look at it.
M: Arriving Heathrow
Tuesday 7:30 p.m. Can’t wait to see you? (sarcastic)Can’t wait to see you, Hmm?
I can’t wait to see her. Jenny, where’s she coming from? What ai
rline is she traveling on? What’s the flight
number?
W: I don’t know. Do you? This telegram is the only information I have.
M: Never mind, Jenny. Let’s have a coffee. We can sit down and think about the best thing to do.
Text 7
W: Hi, how much do you want for this?
M: 150 dollars.
W: What! Don’t try to rip me off! I know what this is worth. 40 dollars, tops.
M: No way! It cost me more than that, 120 dollars.
W: Come on! If you don’t give me a better price, I won’t buy this from you.
M: 110 dollars. Take it or leave it.
W: I’ll give you 55 dollars.
M: I can’t do that. I have to make a living. Give me 100 dollars and it’s yours.
W: That’s still much too expensive. If that’s the lowest you’re willing to give, I’m leaving.
M: Wait, wait! OK, 85 dollars. Final price.
W: I’ll pay 65 dollars, final offer.
M: You drive a hard bargain. I’m losing money on this, but alright, I’ll let you have it for 65 dollars.
W: Thanks a lot. See you next time.
M: Bye.
Text 8
W: Good morning. Housing office. Can I help you?
M: Hi, I’m calling about the low cost housing for graduate students.
W: Do you know it’s only available to married graduate students and their families?
M: Yes, I... I think my wife and I may qualify, since she’s still in graduate school. But I was wondering whether there were any other requirements.
W: Well, unless you have more than one child, you have to have a combined annual income that’s less than fifteen thousand dollars.
M: I’m working as a part time research assistant, so that’s no problem! But right now we’re living with my wife’s parents. Does that mean we’d have to include their income, too?
W: Not necessarily. Why don’t you stop by our office, so I can explain everything in more detail?
M: Sure. See you this afternoon.
Text 9
M: Well, Mary, I already know that you like to watch movies. What other kinds of things are you interested in?
W: I love music and dancing. As a matter of fact, I think my favorite non-work activity is dancing.
M: I like dancing, too. Do you like disco?
W: Sure do. So what about you? Other than traveling and dancing, tell me all about your other interests, and your hobbies.
M: Oh, I enjoy playing sports, and I love exercising. I work out regularly to keep fit.
W: You do look in great
shape.
M: Thanks. Actually, I have lots of hobbies. I love to stay busy. What else do you do in your spare time?
W: I read whenever I get the chance.
M: Oh, read. What are your favorite kinds of novels?
W: Mystery and romance.
M: I’ve heard it said that romance is really a mystery.
W: Yeah. And I’ve heard that “love works in mysterious ways.”
Text 10
Chinese hurdler Liu Xiang, former Olympic and world
champion, returned to competition in style by finishing second at the Shanghai
Golden Grand Prix here on Sunday. Liu’s much anticipated return after 13 months
out injured was cheered by an exciting crowd of 25000 at the Shanghai Stadium.
He fought back from behind to cross the finish line shoulder to shoulder with
arch rival Terrence Trammell of America,
silver medalist in the Berlin World Championships. China’s
110?meter?hurdle star Liu Xiang reacts after crossing the finishing line during
the 110?meter?hurdle competition at the 2009 Shanghai Golden Grand Prix in Shanghai. “This
competition has boosted my confidence and I am sure to improve on this
performance. It showed that I am still able to come out on the track and find
my former self.” The 26?year?old said. Liu trailed Trammell by at least three
meters after 50 meters, but he managed to catch up in the final meters in front
of the fans of Shanghai
where he was born and brought up. Liu just returned to
training in July after a surgery on his right Achilles tendon in the United States
last December. His performance in Shanghai
gave the fans hope that he has been back on the winning track.