英语翻译One kind of TDD looks like a small typewriter.It has rows of buttons.Each button is marked with a letter.Messages are spelled out by pushing the correct buttons.The TDD connects to a telephone through a device called a modem.The modem changes electronic signals from TDD into sounds the telephone can understand.Some TDDs produce messages on paper.Others show them on a television or computer screen.For example,a deaf girl named Linda wants to call h

英语翻译
One kind of TDD looks like a small typewriter.It has rows of buttons.Each button is marked with a letter.Messages are spelled out by pushing the correct buttons.The TDD connects to a telephone through a device called a modem.The modem changes electronic signals from TDD into sounds the telephone can understand.Some TDDs produce messages on paper.Others show them on a television or computer screen.
For example,a deaf girl named Linda wants to call her boy friend,Mark,who is also deaf.First,Linda puts the telephone receiver into the modem.Then she calls Mark’s telephone number by pushing the correct numbered buttons on the telephone.A light on her TDD shows that Mark’s telephone is ringing.
A different light will show if Mark’s telephone is used.Linda will have to wait to call later.If Mark’s telephone is not used,he will see a light going on and off.Then he will know that some one is trying to call him.
46.According to the passage,TDD is ___________.
〔A〕widely used,especially by the deaf
〔B〕widely used by all the deaf in the United States.
〔C〕the same as a small typewriter
〔D〕a special telephone system designed for the deaf
47.How does TDD works according to the passage?
〔A〕It is connected to a telephone through a typewriter.
〔B〕It changes electronic signals into sounds the telephone can recognize.
〔C〕It is connected to a telephone through a modem.
〔D〕It is connected to a telephone through a television.
48.How does the deaf person know that there is a call for him?
〔A〕There will be a message on the screen.
〔B〕The light is sparkling.
〔C〕The telephone rings.
〔D〕The light will be on until he receives the call.
49.How do the deaf people use the TDD?
〔A〕Put the receiver into the modem,and then push the correct numbered buttons.
〔B〕Connect the TDD to their telephones.
〔C〕Send their message to the computer screen.
〔D〕Pick up the receiver and dial the correct number.
50.The author writes this article in order to ___________.
〔A〕persuade us to buy TDDs.
〔B〕tell us that it’s easy for the deaf to make a phone call.
〔C〕tell us some information about TDDs.
〔D〕show that people are kind enough to help the deaf to call each other.