________ life began on the earth is one of the biggest puzzles to scientists．

试卷相关题目

• 1________ this kind of chemical is better has not been tried．

  A.What

  B.That

  C.Whether

  D.Which

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• 2It remains a question_______we can finish the project in such a short time.

  A.what

  B.that

  C.how

  D.when

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• 3________ worried her was what she had done might make things worse．

  A.What

  B.What

  C.What

  D.Who

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• 4In Britain, ________ are called“private schools”are not owned by privates at all．

  A.as

  B.which

  C.what

  D.that

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• 5_________ expects a good mark in the exam is supposed to make great efforts in their daily learning．

  A.The one

  B.Anyone

  C.Whoever

  D.Who

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