阅读短文,回答题。C Sleep Lets Brain File Memories 1 To sleep. Perc

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在一级堤防上建一个小型穿堤涵洞,该穿堤涵洞建筑物的级别是(  )。

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根据规定,对于银行汇票,下列说法正确的有(  )。

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The purpose of the author in writing this passage is ______

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Which of the following is true according to the text?

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