Is it a wonder that ____ little cells can store ______　much energy?

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• 1Scientists study ___________ human brains work to make computer.

  A.when

  B.how

  C.that

  D.whether

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• 2______ he has made a decision, it is not easy for you to make him change his mind.

  A.Though

  B.Unless

  C.Until

  D.Once

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• 3Believe it or not, that is _____ people call the sixth sense.

  A.when

  B.what

  C.why

  D.which

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• 4—Why are you staring at me? —You look stupid!The way you wear is ______ annoys me most.

  A.which

  B.where

  C.how

  D.what

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• 5______the Internet is of great help, I don't think it's a food idea to spend too much time on it.

  A.If

  B.While

  C.Because

  D.As

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• 6____ we get on well with a number of people , we are usually friends with only a very few．

  A.As

  B.Once

  C.Before

  D.While

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• 7Pointing to the house on ____roof grew lots of bush, the old man told me that was ____ I would stay.

  A.its; what

  B.whose; what

  C.whose; where

  D.its; where

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• 8---How long has your brother been working here? ---_______ he graduated from college in 2007.

  A.When

  B.Until

  C.Long before

  D.Ever since

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• 9The teacher asked the two students to discuss the question in a low voice ________ they should bother the others.

  A.so that

  B.in case

  C.in order that

  D.now that

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• 10Scarcely had they settled themselves in their seats in the theatre ______ the curtain went up.

  A.then

  B.before

  C.when

  D.then

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