When Scotsman Alexander Graham Bell inve

题型:阅读理解

问题:

When Scotsman Alexander Graham Bell invented the telephone in 1876, it was a revolution in communication.Over the last two decades a new means of spoken communication has emerged: the mobile phone.

The modern mobile phone is a more complex version of the two-way radio.Traditional two-way radio was a very limited means of communication.As soon as the users moved out of range of each other’s broadcast area, the signal was lost.In the 1940s, researchers began experimenting with the idea of using a number of radio masts (天线杆)located around to pick up signals from two-way radios.A caller would always be within range of one of the masts; when he or she moved too far away from one mast, the next mast would pick up the signal.(Scientists referred to each mast’s reception area as being a separate "cell"; this is why in.many countries mobile phones are called "cell phones".)

The first real mobile telephone call was made in 1973 by Dr Martin Cooper.As soon as his invention was completed,, he tested it by calling another scientist to announce his success.Within a decade, mobile phones became available to the public.They have changed the way we do a lot of things.One powerful feature is the Short Message Service (SMS) or text message.It’s the perfect communication method for the busy modern lifestyle.Going to be late? Send a text message! The text message has changed the way we write in English.The language construction became less strict.Traditional rules of grammar and spelling are much less important when you’re sitting on the bus, hurriedly typing "Will B 15mm late-C U @ the bar.(I will be 15 minutes late to see you at the

bar.) Sorry!".

Over the last few years mobiles have become more and more advanced.We have seen the instruction of cameras, global positioning system and Internet access.

Alexander Graham Bell would be surprised if he could see how far the science of telephone has progressed in less than 150 years.If he were around today, he might say: "That’s gr8(great)! But I’m busy rite now(I am very busy right now).Will call U2nite(I will call you tonight.)."

小题1:The writing style of the passage is a (an)___.

A.narrative

B.description

C.essay

D.review小题2:The article is intended to__     _.

A.warn people of the possible risks in using mobile phones

B.inform readers of the history and benefits of mobile phones

C.convince people of the uses of mobile phones

D.predict the applications of mobile phones小题3:What do you think of the writer according to the last paragraph.

A.Humorous.

B.Ironic.

C.Kind.

D.Worried.

考点:历史文化类阅读
题型:阅读理解

—The cars give off a great deal of waste gas in the street.

—Yes, But I’m sure something will be done to       air pollution.

A.reduce

B.remove

C.collect

D.warn

题型:阅读理解

现有H2SO4、NaOH、CuO、Na2CO3四种物质,分别与其他物质反应,都有同一种物质X生成,则X的化学式可能是(  )

A.CO2

B.H2O

C.NaCl

D.BaSO4

题型:阅读理解

20MHz组网下,下行控制域最多占用()OFDM符号。

题型:阅读理解

某公司2009年1月1日发行在外普通股30000万股,7月1日以2008年12月31日总股本30000万股为基数每10股送2股;11月1日回购普通股2400万股,以备将来奖励管理层之用。若该公司2009年度净利润29904万元,则其2009年度基本每股收益为( )元。

A.0.74

B.0.84

C.0.89

D.0.92

题型:阅读理解

蛋白质二级结构是指分子中

A.氨基酸的排列顺序
B.每一氨基酸侧链的空间构象
C.局部主链的空间构象
D.亚基间相对的空间位置
E.每一原子的相对空间位置

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