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The passage gives an insight into how the United States could develop a new transport policy for the 21st century.

【参考答案】

N

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Low levels of carbon monoxide are not poisonous for healthy individuals.

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1. 表示欢迎 2. 介绍学校的有关情况(如图书馆、饭厅和体育活动场所等); 3. 遇到困难该如何解决。 A Welcome Speech to New Students