VEP

One of the most popular items in the school newspaper is the advice column (专栏). Here are some of the questions asked and their answers.

Q: I’m always late for school. I try not to be late, but I can’t help it. Please advise me about what to do. Tommy.

A: You are probably late for school because you don’t really like school. My advice to you is to enjoy school more, and then you won’t be late so often.

Q: I find it difficult to make friends. What do you think I should do? Sara.

A: I can’t advise you until I know more about you. Your problem may be that you are shy. On the other hand, it may be the opposite. You may be bold(大胆的). Write and tell me more about yourself.

Q: I’m always at the bottom (末尾)of the class. What do you advise me to do? Molly.

A: I advise you to try to improve your grades in one subject at first. Next, try to improve your grades in another subject. If you do this, by the end of the year you should be quite a long way up from the bottom in all your subjects.

小题1:What is the main idea (主要意思) of this passage?

A．The town newspaper has an advice column.

B．Tommy wrote to the school newspaper to ask for advice.

C．Sara finds it difficult to make friends.

D．The advice column in the newspaper is very popular.小题2:What is Tommy’s problem?

A．He is always late for school.

B．He finds it difficult to make friends.

C．He is always at the bottom of the class.

D．He needs help with his homework.小题3:What does the adviser (建议者) want Sara to do?

A．Stop being so shy.

B．Stop being so bold.

C．Make more friends.

D．Give more information about herself.小题4:What does Molly want to do?

A．Make more friends.

B．Enjoy school more.

C．Stay at the bottom of her class.

D．Improve her exam results.小题5:By the end of the year, where should Molly be in all her subjects if she does as the adviser says?

A．At the bottom.

B．A little way up from the bottom.

C．Quite a long way up from the bottom.

D．At the top.

所示，在竖直平面内倾斜轨道与半径为R的半圆轨道平滑连接，点A与半圆轨道的最高点C等高，B为轨道最低点，现让小滑块（可视为质点）从A点开始以初速度v₀沿斜面向下运动，不计一切摩擦，重力加速度为g，关于滑块运动情况的分析，正确的是（　　）

A．若v₀=0，小滑块不能通过C点

B．若v₀=0，小滑块恰能通过C点，且离开C点后做自由落体

C．若v0=

gR

，小滑块能到达C点，且离开C点后做自由落体运动

D．若v0=

gR，小滑块能到达C点，且离开C点后做平抛运动

下列仪器中，不能加热的是（　　）

A．烧杯

B．试管

C．烧瓶

D．容量瓶

除夕，老李一家吃着团圆饭，说着开心事。     

李大爷说：“我们钢铁公司是国营骨干企业，今年公司产值突破了31亿元，利税达到5.1亿元，光年终奖金我就拿了5000元。”     

李大妈说：“我们服装厂是乡镇企业，以前只能接受外贸订单，还要看外国人的脸色。今年引进了一套西服生产流水线，当年投产当年见效，光是税收就上缴了30万元。嘿，我还拿了2000元红包。”     

儿子李强说：“我开的电脑公司，就这几天，光电脑就卖出去了20多台。”     

媳妇王芳说：“还说呢，我都累死了。我那个美容院生意好得不得了，请了18个员工，一直做到现在才把最后一个客人送走。年初二又有十几个新娘要等我给她们化妆。看来，我是没法跟你们出去旅游了。”     

这时，孙子李明拿来了计算器，嚷着要算算大家今年一年的收入。不一会儿，他惊叫起来：“哇，我们家是30万元户了！这回，该买辆小汽车了吧！”     

大家听了，都哈哈大笑起来……

（1）老李一家人所从事的职业分别属于哪种经济成分？ 

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（2）这些经济成分在国民经济中各发挥了什么作用？

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什么是开路电势？