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A turkey named Courage gave thanks to President Obama for saving his life on the day before Thanksgiving.

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李白的诗句“三川北虏乱如麻，四海南渡似永嘉。”描写的是西晋永嘉五年，中原人民纷纷迁居江南的情景。从中可以看出，北方人民南迁是因为 [ ]

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How was your interview today? I made it! It was extremely crowded，but I had the______of　interviewing the famous writer in the end.

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某同学在做氢气还原氧化铜的实验时，试管破裂了．请举出三个可能导致试管破裂的原因：

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