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

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• 1We 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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• 2What is called "echo"、  _____

  A.Very loud voices

  B.Very loud voices that are made by man

  C.Very loud voices that are made by animals

  D.The sound that is made by man or animals comes back from some place

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• 3Which 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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• 4In 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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• 5From 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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• 6From 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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• 7If 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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