What is called "echo"、  _____

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• 1Which is the best tide for this passage、 _____  .

  A.Big Cities

  B.Interesting Things in Big Cities

  C.Good Schools in Big Cities

  D.New York, London and Paris

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• 2In this passage the writer thinks it is right for people _____.

  A.to move to big cities

  B.not to move to big cities

  C.to move to big cities without thinking of any problems

  D.to move to big cities after they think over the problems of living there

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• 3From the passage we know that _____.

  A.people in big cities are usually very dirty

  B.Paris is an exciting place for people to live in

  C.people will no longer like living in big cities

  D.big cities don't have serious problems

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• 4Which of the following is TRUE according to the passage、 _____  .

  A.Big cities are not clean and safe enough

  B.People can easily find good places to live in in big cities

  C.People can always find work to do in big cities

  D.All people like to live in big cities

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• 5In big cities people can do all of the following EXCEPT _____.

  A.going to different kinds of museums

  B.seeing many kinds of plays and films

  C.buying things from all over the world

  D.living there with little money

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• 6We can hear our echoes if we _____.

  A.shout in a small room

  B.shout in a large house full of things

  C.shout in narrow valleys (山谷)

  D.shout in the open air

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• 7Which is the right order of hearing our echo in a very large, empty hall、 _____.

  A.We hear the reflected sound

  B.The sound returns to us

  C.The sound hits the walls

  D.We make a soundA.c, b, a, dB.c, a, b, dC.d, c, b, aD.d, b, c, a

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• 8From the text we learn that _____.

  A.reflected sound is useful only to blind people

  B.people haven't made use of reflected sound yet

  C.Bats use reflected sound to fly and get food

  D.Whales don't use reflected sound as they live in the sea

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• 9If you haven't got a megaphone, _____  will help you to make your voice travel farther.

  A.a long piece of wood

  B.a roll of cardboard

  C.a thin thread

  D.a long piece of silk

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