Now a paper in Science argues that organic chemicals in the rock come mostly from ________ on earth rather than bacteria on Mars.

试卷相关题目

• 1Whether you live to eat or eat to live, food is a major ________ in every family’s budget.

  A.nutrition

  B.expenditure

  C.routine

  D.provision

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• 2The police were alerted that the escaped criminal might be in the ________.

  A.vain

  B.vicinity

  C.court

  D.jail

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• 3Fiber-optic cables can carry hundreds of telephone conversations ________.

  A.simultaneously

  B.spontaneously

  C.homogeneously

  D.contemporarily

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• 4She remains confident and ________ untroubled by our present problems.

  A.indefinitely

  B.infinitely

  C.optimistically

  D.seemingly

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• 5The ________ cycle of life and death is a subject of interest to scientists and philosophers alike.

  A.incompatible

  B.exceeding

  C.instantaneous

  D.eternal

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• 6There is much I enjoy about the changing seasons, but my favorite time is the ________ from fall to winter.

  A.transmission

  B.transformation

  C.transition

  D.transfer

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• 7I think we need to see an investment ________ before we make an expensive mistake.

  A.guide

  B.entrepreneur

  C.consultant

  D.assessor

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• 8The ________ on this apartment expires in a year’s time.

  A.treaty

  B.lease

  C.engagement

  D.subsidy

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• 9The elderly Russians find it hard to live on their state ________.

  A.pensions

  B.earnings

  C.salaries

  D.donations

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• 10There is supposed to be a safety ________ which makes it impossible for trains to collide.

  A.appliance

  B.accessory

  C.machine

  D.mechanism

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