Carbon, _______ is a very important part of living things on the earth, is rare on the moon.

试卷相关题目

• 1_______ is not clear.

  A.That he will come

  B.He will come

  C.Whether he will come

  D.If he will come

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• 2Cooperation should _______ for mutual benefit in energy development and utilization.

  A.be enhanced

  B.enhance

  C.have enhanced

  D.to be enhanced

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• 3Devotion means _______ our heart on one thing at a time and give up all other thoughts.

  A.setting

  B.set

  C.to set

  D.that setting

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• 4The playing cards we use today are much like those ______ for hundreds of years.

  A.were used

  B.used

  C.been used

  D.using

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• 5I hope to hear more about the activities ______ there.

  A.being happened

  B.to be happened

  C.going on

  D.being gone on

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• 6As ______ chairman of _____committee, I declare the meeting open.

  A.the, 不填

  B.the, the

  C.不填, 不填

  D.不填, the

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• 7While he was in the office, he preferred ______ something  _____nothing.

  A.to do, to do

  B.to do, doing

  C.doing, to do

  D.doing, to doing

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• 8The President declared that the nation's energy demands _____ so rapidly since 1968.

  A.have grown .

  B.had grown

  C.grows

  D.has grown

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• 9As a signatory to the Kyoto pact on climate change, Britain _____ carbon emissions by 20 percent by 2010.

  A.had reduced

  B.must reduce

  C.may reduce

  D.ought to have reduced

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• 10It's time _____ you _____ relax.

  A.for, to

  B.to, for

  C.for, for

  D.to, to

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