Practical application of this principle resulted in ________.

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• 1Sound waves reflected from a hill can be used to estimate the ________.

  A.height of the hill

  B.speed of sound

  C.distance to the hill

  D.intensity of sound

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• 2According to the selection, muscle participation in the process of thinking is ________.

  A.deliberate

  B.obvious

  C.not readily apparent

  D.very pronounced

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• 3Body movements are necessary in order for the listener to ________.

  A.hear the music

  B.appreciate the music

  C.enjoy the music fully

  D.completely understand the music

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• 4Few people are able to listen to familiar music without ________.

  A.moving some part of their body

  B.stopping what they are doing

  C.directing the orchestra playing it

  D.wishing that they could conduct music properly

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• 5The process of thinking and that of listening are similar in that ________.

  A.both are mental acts

  B.muscles participate in both processes

  C.both processes are performed by the entire body

  D.we derive equal enjoyment from them

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• 6The British used radio waves because they ________.

  A.were more exact than sound waves

  B.could not be detected

  C.could penetrate fog and clouds

  D.were easier to use than sound waves

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• 7Which of the following is NOT stated but implied in the passage、

  A.Light waves could be used in a device similar to radar.

  B.Radar was a practical application of a well-known principle

  C.Radar greatly increased the effectiveness of RAF.

  D.Sound waves are reflected from a hillside under all conditions.

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• 8The author of this selection probably intended to explain ________.

  A.exactly how radar works

  B.why the British used radio waves in their device

  C.how the word “radar” came into being

  D.how radar helped the British win the Battle of Britain

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• 9天快黑了，该回家了。

  A.It’s black, and it is time to go home.

  B.It’s getting dark, and it is the time to go home.

  C.It’s getting dark, and it is time to go home.

  D.It’s dark, and it is time to go hom

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• 10离开房间时请关灯。

  A.Please turn on the lights when leaving the room.

  B.Please turn off the lights when you leaving the room.

  C.Please turn on the lights when to leave the room.

  D.Please turn off the lights when leaving the room.

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