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1. To keep the children safe,all the workers are trying their best to b        the bridge.

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根据短文内容,选择最佳答案。

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   A. less than thirty years

   B. more than forty years

   C. more than sixty years

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   A. most of the computers

   B. more than half of the computers

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   A. the history of the Internet

   B. the history of the computers

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