单项选择题

Questions 18 to 20 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions.
Now, listen to the passage.
What is the passage mainly about

A．The China-U.S. relations.
B．The Nixon Library.
C．President Nixon.
D．The Youth Summit.

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单项选择题

单项选择题

Questions 18 to 20 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions. Now, listen to the passage. What is the passage mainly about 您的浏览器不支持 audio 元素。