精密度的大小是由（）误差决定的。 A.系统误差 B.偶然误差 C.系统误差和偶然误差

Across the world, mobile phones are very popular with young people. They think that the phones are more than a means of communication — having a mobile phone shows that they are cool and connected.

The explosion in mobile phone use around the world has worried some health professionals. Some doctors are concerned that in the future many people will suffer from health problems because of the use of mobile phones. But mobile phone companies say that there is no proof that mobile phones are bad for health.

On the other hand, why do some medical studies show changes in the brain cells of some people who use mobile phones? Signs of change in the tissue (组织) of the brain and head can be detected with modern scanning equipment. In one case, a traveling salesman had to retire at a young age due to the fact that he couldn’t remember even simple tasks. The man had been talking on his mobile phone for about six hours a day for a couple of years. His family doctor blamed his mobile phone use.

What is it that makes mobile phones potentially harmful? The answer is radiation. High-tech machines can detect very small amounts of radiation from mobile phones. Mobile phone companies agree that there is some radiation, but they say the amount is too small to worry about.

As the discussion about their safety continues, it appears that it is better to use mobile phones less often. Use a normal phone if you want to talk for a long time. Use your mobile phone only when you really need it. Mobile phones can be very useful and convenient, especially in emergencies. So, for now, it is wise not to use your mobile phone too often.

小题1:Why do young people buy mobile phones according to the passage?

(No more than 11 words) (2 marks)

_____________________________________________________________________

小题2:Why did the salesman mentioned in the passage retire young?

(No more than 7 words) (2 marks)

____________________________________________________________________

小题3:What do the manufacturing companies think of the safety issue of mobile phones?

(No more than 14 words) (3 marks)

_____________________________________________________________________

小题4:What’s the purpose of the author’s writing this passage?   (No more than 11 words) (3 marks)                                            

_____________________________________________________________________

Many teenagers feel that the most important people in their lives are their friends. They believe that their family members, especially their parents, don’t know them as well as their friends do. In a large family, it is quite often for brothers and sisters to fight with each other and then they only go to their friends for getting ideas.

It is very important for teenagers to have one good friend or a circle of friends. Even when they are not with their friends, they usually spend a lot of time talking among them on the phone. This communication is very important in children’s growing up, because they can not discuss something difficult to their family members.

Parents often try to choose their children’s friends for them.Some parents may even stop their children from meeting their good friends: The question of “choice” is an interesting one. Have you ever thought of the following questions?

    Who choose your friends?

Do you choose your friend or your friends choose you?

Have you got a good friend your parents don’t like?

Your answers are welcome.

小题1:Who know them better than their parents for the teenagers?

A．Their parents.

B．Their friends.

C．Brothers and sisters.

D．Family members.小题2:How do they communicate when the teenagers stay alone?

A．Go to their friends.

B．Talk with their parents:

C．Talk with their friends on the phone.

D．Have a discussion with their family by phone.小题3:Which of the following sentences is true?

A．Parents should like everything their children enjoy.

B．In all families, children can choose everything they like.

C．Teenagers can only go to their friends for help.

D．Parents should try their best to understand their children better.小题4:What is the meaning for “Your answers are welcome. ”?

A．You are welcome to have a discussion with us.

B．You have got an idea, so your answers are welcome.

C．Your answers are always right.

D．You can give us all the right answers.小题5:. Which is the best title of this passage?

A．Only parents can decide.

B．Parents and children.

C．A strange question.

D．Teenagers need friends.

通常城市一次送电电压和二次送电电压分别为( )。

A．220kV、66kV

B．220kV、110kV

C．380kV、110kV

D．500kV、35kV

要使个体能够形成正确的世界观、人生观及价值观，其思维发展应达到一定的水平，具体为（）。

A.思维对象的社会性

B.思维能力的分化与未来职业定向相联系

C.思维策略水平的明显提高

D.思维具有极强的独立性

E.辩证思维能力的提高

全轮驱动式汽车传动系有（），而其它驱动型式的汽车的传动系没有该部件。

A、变速器

B、分动器

C、同步器