Historical experience can ____ as a most important source of information.

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• 1---Mum, it is nice weather. I want to skate this afternoon. ---Don't you think the ice on the lake is too thin to  ____  your weight?

  A.stand

  B.bear

  C.catch

  D.take

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• 2The dinosaur's eggs are found by explorers in the _______

  A.1920s

  B.1920's

  C.1920s'

  D.1920'

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• 3In order to continue to learn by ourselves when we leave school someday, we must ______ learn how to study in the school now.

  A.in all

  B.after all

  C.above all

  D.at all

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• 4The generation _____ makes it difficult for parents to understand their children's opinions.

  A.division

  B.gap

  C.separation

  D.interval

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• 5. Only_______of the houses in the town________ not destroyed in Wenchuan big earthquake.   

  A.one fifth; was

  B.one fifths; were

  C.one fifths; was

  D.one fifth; were

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• 6On the long journey, Peter ________ a most interesting guide．We all had a wonderful time．

  A.practiced

  B.behaved

  C.proved

  D.conducted

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• 7As far as I know, this maths problem is ________ that one.

  A.twice so difficult as

  B.twice as difficult as

  C.as twice difficult as

  D.so twice difficult as

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• 8.They have their reasons for keeping their marriage _____ secret for _____ moment.

  A.the; a

  B.the; the

  C.a; the

  D.a; a

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• 9We already have ______ pencils, but we need two ______ pens.

  A.dozen of, dozen

  B.dozens of, dozens

  C.dozens of, dozen

  D.dozens of, dozen of

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• 10The boys always stays here for ________. 

  A.one and half hour

  B.one and half a hour

  C.one and a half hours

  D.one and half hours

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