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

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• 1From 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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• 2Which 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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• 3We 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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• 4What 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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• 5Which 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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