Since 1939, numerous scientific studies _____ to determine whether smoking is a health hazard.

试卷相关题目

• 1If all the continents and mountains were bulldozed fiat, the earth _____ by water more than 12,000 feet deep.

  A.could have been covered

  B.might had been covered

  C.is covered

  D.would be covered

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• 2The ancient Egyptians believed all illnesses were related to _____ was eaten.

  A.what

  B.which

  C.it

  D.that

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• 3More than two thousands _____ work in this refinery.

  A.Russias

  B.Russian

  C.Russians

  D.Russia

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• 4I wish to thank you for the incomparable hospitality for _____ the Chinese people are justly famous throughout the world.

  A.what

  B.whom

  C.that

  D.which

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• 5The young receptionist doesn't permit _____ in the exhibition center.

  A.smoking

  B.to smoke

  C.smoke

  D.to have smoked

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• 6All the money _____, we started looking for work.

  A.has been spent

  B.have been spent

  C.being spent

  D.having been spent

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• 7One main branch of sea science, _____, holds enormous unanswered questions.

  A.physical oceanography

  B.is physical oceanography

  C.called physical oceanography

  D.what is physical oceanography

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• 8An _____ crowd is awaiting the arrival of the famed statesman.

  A.excite

  B.excitedly

  C.excited

  D.exciting

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• 9There _____ a lot of _____ on the roads yesterday.

  A.were...traffic

  B.was...traffic

  C.were...traffics

  D.was...traffics

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• 10China and America are separated by _____.

  A.Pacific Ocean

  B.a Pacific Ocean

  C.the Pacific Ocean

  D.Pacific Oceans

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