An acre of roses yields one ton of rose petals, ____only a pound of essential oil can be distilled(提炼出) .

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• 1Geologists use artificial earth shocks____petroleum.

  A.they search for

  B.in their search for

  C.and search for

  D.to be search for

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• 2A debate is a series of formal spoken arguments for and against____

  A.a proposal is definite

  B.a definite proposal

  C.definitely a proposal is

  D.a proposal that definitely

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• 3____deserts may have marshes in low places and near springs .

  A.Even though

  B.Are even

  C.Even

  D.They are even

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• 4____images out of clay, stone, and metal.

  A.The shaping of sculpture

  B.Sculpturing the shape

  C.To shape sculpture

  D.Sculptors shape

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• 5____the history of the rough, strong-willed Nebraska farmer .

  A.Not only is much of the history of Nebraska

  B.Although it is much of the history of Nebraska that is

  C.It is as much the history of Nebraska’s being

  D.Much of the history of Nebraska is

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• 6____is for him to decide.

  A.When leaving

  B.When shall we leave

  C.When we leave

  D.When we have left

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• 7It ____that space is limitless.

  A.believes

  B.was generally believed

  C.believed

  D.is generally believed

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• 8The reason Einstein left Germany to America is____

  A.because Hitler persecuted the Jews

  B.since Hitler persecuted the Jews

  C.on account of the fact that Hitler persecuted the Jews

  D.that Hitler persecuted the Jews

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• 9After a whole day of hard work, all ____was a nice meal and a good rest.

  A.what he wanted

  B.which he wanted

  C.the thing he wanted

  D.that he wanted

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• 10A modern city has sprung up in____was a wasteland ten years ago.

  A.which

  B.what

  C.that

  D.where

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