________ some doubt among scientists about the cause of cancer.

试卷相关题目

• 1I don't know the restaurant，but it is ____ to be quite a good one.

  A.said

  B.told

  C.spoken

  D.talked

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• 2There is no doubt ________ our educational system leaves something to be desired．

  A.what

  B.whether

  C.if

  D.that

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• 3---My room gets very cold at night. ---__________

  A.So is mine

  B.So mine is

  C.So does mine

  D.So mine does

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• 4Hardly _______ to speak when the audience interrupted him.

  A.he began

  B.he had begun

  C.had he begun

  D.did he begin

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• 5Facing the poor grades, Maria is wondering what it_____to learn English well.

  A.takes

  B.uses

  C.makes

  D.prepares

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• 6Some scientists believe that it won't be long _______ robots are widely used in all walks of life．

  A.since

  B.after

  C.before

  D.until

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• 7Only by imagining and creating ________ a difference

  A.can make

  B.you can make

  C.make

  D.can you make

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• 8Jack is ______ go to school,so his mother has to stay at home to look after him.

  A.young enough to

  B.old enough to

  C.too young to

  D.very old to

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• 9Modern science has given clear evidence ______ smoking can lead to many diseases

  A.what

  B.which

  C.that

  D.where

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• 10 ________should be paid to our study,and only in this way ________make progress.

  A.Heart;we can

  B.Mind;can we

  C.Attention;can we

  D.Notice;we can

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