问题 填空题

磁悬浮列车是利用同名磁极相互      的原理来实现悬浮的;磁带和磁卡是利用了磁性材

料能够被       的原理制成的。

答案

排斥  磁化

考点:

分析:解答此题需要掌握两方面的内容:

①磁极间的作用规律:同名磁极相互排斥,异名磁极相互吸引;

②磁带和磁卡都是利用它们能被磁化来记录信息的.

解答:解:磁悬浮列车的目的是:减小车和轨道之间的摩擦,提高车速.所以利用同名磁极相互排斥,使列车微微离开轨道,减小了摩擦.

磁带、磁卡都有一层磁性微粒材料,刚生产出的磁带、磁卡都不带磁性,当它们被信号电流磁化时,就会留下特定的信息,这样就能记录下人们要表达的信息;

故答案为:排斥,磁化.

点评:本题主要考查:磁体、磁性、磁极间的相互作用,虽然是一道小综合题,但比较简单.

阅读理解

1n 2007.five young people in the American state of Massachusetts developed an idea.The team knew that the world is filled with mobile phones.About eighty percent of all people are said to live within reach ofa wireless telephone signal.   

The idea was to use mobile phones and the Internet to connect job seekers with employers.The young people wrote a business plan and formed a company called Assured Labor.

Assured Labor won a development competition at the Massachusetts Institute of Technology

(MIT).Three of the founders were graduate students there. 

Assured Labo ris an electronic market place.It has two parts.One is for;the Unied States.That operation was launched in January in Boston.It links pe'ople with employeis offering temporary jobs.

The other arm of the business is for developing markets.That operation is meant to help people get mbfe permanent jobs.A representative is currently building partnerships with universities,and international compaines in Central America.

Assured Labor’s presidenL David Reich,says the companies now place job advertisements on radio or in newspapers.Some even drive around in cars with loudspeakers announcing that jobs are available.He says the companies are interested.in having more modem hiring practices.

Through Assured Labpr,companies will list open positions on the Internet.People who think

they could do the job could reply by text messags or on their cellphones.

This is how the system works in Boston.

The jobs available include house cleaning.dog walking and home repai.People who want their house cleaned,for example,can look online at a list of twenty housekeepers.The list tells what services.they offer,and how much they want to be paid.People need two letters praising their work to get on the list of service providers.

The employer chooses workers they would like jto hire ,The company then sends the workers a text or e-mail message so they can respond quickly to an offer.

After a job is completed,the employer and employee rate each other, The rating is kept for  future use.Assured Labor is not charging anyone,right now,but the plan is to have employers pay for the service.   

61.Assured Labour is founded by               

A.David Reich                   B.five young people in Massachusetts

C an uknown expert                D.three graduate students fromMIT

62.what kinds ofjobs does Assured Labor offer?

A.Temporary jobs.              B.Permanent jobs.

C.Free jobs                       D, BothA and B·

63.Which is NOT one of the means for Assured。Labor to advertise jobsavailable?'

A.Radio     B.Newspapers    C.TV programmes     D.Cars with loudspeakers

64.Which of the following is the proper procedure to seek a job through  Assured Labor?

a.  People can look online at a list of jobs

b.Companies will list open positions on the Internet.

c.The company sends the workers a text or e-mail message.

d.The workers can respond to an offer.

e.The employer'chooses workers they would like to hire.

A.acdbe         B.baecd        C.bedae          D.abdea

65.What can be inferred from the passage?

A.The present hiring practices need to be improved.

B.Employers don’t need to pay Assured Labour.

C.Universities also join  Assured Labor for financial help

D. Assured Labor only offers household jobs.

66.Which of the following can be the best title of the passage?

A.An Electronic MarketPlace

B. Mobile Phones and Markets

C. Getting Into Job Market by Mobile Phone

D .Job Seekers and Markets