The author of this selection probably intended to explain ________.

试卷相关题目

• 1Which 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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• 2The 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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• 3Practical application of this principle resulted in ________.

  A.new electronic instruments for planes

  B.a radio directing and ranging device

  C.new radio sets for RAF bombers

  D.an electronic detecting device

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• 4Sound 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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• 5According 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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• 6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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• 7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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• 8听到这个消息，他们立即出发去飞机场。

  A.Hearing the news, they immediately went for the airport.

  B.To hear the news, they immediately left for the airport.

  C.Hearing the news, they immediately left for the airport.

  D.To hear the news, they immediately left at the airport.

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• 9中国春节的习俗是全家团聚。

  A.It’s customary to have a family reunion in spring festival in China.

  B.It’s customary to have a family reunion on Spring Festival in China.

  C.It’s customary to have a family reunion in Spring Festival in China.

  D.There’s customary to have a family reunion on Spring Festival in China.

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• 10自从上次你写信以来，这里发生了很多事情。

  A.Many things had happened here since you wrote to me last time.

  B.Many things have happened here since you wrote me last time.

  C.Many things happened here since you wrote to me next time.

  D.Many things have happened here since you wrote to me last tim

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