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You are about to say something to your younger brother when he gestures that he’s got a phone message．

    “But I didn’t hear the ring，”you say．

    “Because you are too old，”your brother answers．

     Don’t get mad．He’s just telling you the truth．

     Teenagers in Britain and the US have a weapon against the older generation，especially parents and teachers．It’s a ring tone that many adults cannot hear．

     According to a recent report from the New York Times，in some Manhattan schools，students have begun using the technology．Cellphone use is usually forbidden in class．But using the high-pitched （頻率） ring tone，students can successfully exchange phone messages without being found by their teachers．

      The technology relies on the fact that most adults gradually lose the ability to hear high-pitched sounds, It was developed in Britain but has recently spread to America by the Internet.

      However，the technology was originally aimed at annoying teenagers，not the other way around.

     Called the Mosquito，it was marketed last year by a Welsh security company．It is an ear-splitting 17-kilohertz buzzer （蜂鳴器） designed to help shopkeepers get rid of young people hanging around in front of their stores．Humans can hear sounds taking place in a frequency range between 200 and 20,000 hertz，as the research shows．But our hearing gradually becomes worse when we grow up．

1．Students in some Manhattan schools have begun using the technology，so they can_________．

A．talk in class without being heard by their teachers

B．use cellphones to send messages in class

C．hear better in class than their teachers

D．improve their hearing ability

2．The underlined phrase “the other way around” implies the ________.

A．adults are annoyed now

B．teenagers are annoyed now

C．adults are not annoyed now

D．both adults and teenagers are annoyed now

3．According to this passage，what will happen to a person when he is over twenty?

A．He can hear sounds with frequencies between 200 and 20,000 hertz．

B．He can hear sounds with a frequency of 17-kilohertz．

C．He cannot hear sounds with frequencies between 200 and 20,000 hertz．

D．He cannot hear sounds with a frequency of 17-kilohertz．

4．It can be concluded from the passage that _________.

A．older people hear no better than teenagers

B．older people had better not use cellphones

C．teenagers hear better than old people 

D．teenagers had better not use cellphones

1．B    2．A    3．D    4．C

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