Researchers are not always careful to distinguish correlation between cause and（  ）。

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• 1Energy-oil, gas, electricity-is going to be in shut supply for a long time, and whatever energy（  ）it will cost a let more。

  A.access

  B.available

  C.useful

  D.popular

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• 2Arm prefers（  ）taking an examination。

  A.writingateampaperthan

  B.writingateampaperto

  C.towriteateampaperand

  D.towriteatompaperthan

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• 3Professor Richardson had a little trouble（  ）for his research project。

  A.collectingdata

  B.tocollectdata

  C.collecteddata

  D.collectdata

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• 4John did not feel well yesterday; otherwise he（  ）to see his classmates off。

  A.came

  B.wouldcome

  C.wouldhovecome

  D.shouldbecoming

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• 5I was to have made a speech if（  ）。

  A.I was notinterrupted

  B.nobody would have interrupted me

  C.I had not been interruptedme

  D.it were not interrupted

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• 6Differences in gender are all（  ）in the use of this language。

  A.expressed

  B.reflected

  C.conveyed

  D.indicated

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• 7Mrs.Brown’s children have very good manners because they have been well（  ）。

  A.broughtin

  B.broughtout

  C.broughtup

  D.broughttogether

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• 8The study of the mysterious “black holes in space”is a new（  ）of research in astrophysics。

  A.doctrine

  B.area

  C.factor

  D.proficiency

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• 9There is very little rain in this region the country（  ）we often have crop failures。

  A.accordingly

  B.simultaneously

  C.relatively

  D.necessarily

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• 10It is important that people from different cultures come to understand each other and develop （  ）trust。

  A.identical

  B.mutual

  C.relevant

  D.relative

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