PASSAGE FOUR [br] Why does the writer mention Columbus and Marco Polo?To demonst

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问题 PASSAGE FOUR [br] Why does the writer mention Columbus and Marco Polo?

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答案 To demonstrate that things considered impossible can really happen．

解析第一段指出：纵观人类历史，人们对于出海航行曾经非常担忧，认为船会在世界的边缘坠落(因为那时人们不知道地球是圆的)。然而事实证明很多被认为不可能的事情后来都真的发生了，哥伦布和马可波罗的航海经历便是例子。

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