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

试卷相关题目

• 1All 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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• 2Since 1939, numerous scientific studies _____ to determine whether smoking is a health hazard.

  A.have been conducted

  B.are conducted

  C.is conducted

  D.being conducted

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• 3If 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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• 4The ancient Egyptians believed all illnesses were related to _____ was eaten.

  A.what

  B.which

  C.it

  D.that

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• 5More than two thousands _____ work in this refinery.

  A.Russias

  B.Russian

  C.Russians

  D.Russia

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• 6An _____ crowd is awaiting the arrival of the famed statesman.

  A.excite

  B.excitedly

  C.excited

  D.exciting

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• 7There _____ a lot of _____ on the roads yesterday.

  A.were...traffic

  B.was...traffic

  C.were...traffics

  D.was...traffics

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• 8China and America are separated by _____.

  A.Pacific Ocean

  B.a Pacific Ocean

  C.the Pacific Ocean

  D.Pacific Oceans

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• 9_____ to completely cut off its oil supply, it would badly damage its own economy.

  A.If Iran was

  B.Was Iran

  C.If Iran is

  D.Were Iran

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• 10_____ in 1943 _____ the harmful smog made its appearance in Los Angeles.

  A.Only...that

  B.It was...then

  C.That it was...when

  D.It was...that

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