单选题：This passage is largely about

题目分类：卫生类
题目类型：单选题
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题目内容：

This passage is largely about A．how difficult it is to become a doctor in Americ
B．how American medical education has developed in histor
C．how nice the American medical education system i
D．how to become a good docto

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The conference explored the possibility of closer trade links.A．rejected B．inves

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