单项选择题

Questions 30 to 32 are based on the passage you have just heard.

A．He knew this beforehand.
B．He judged from his common sense.
C．He judged from the speeds of sound
D．He judged by reading the textbook.

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pollution

Questions 30 to 32 are based on the passage you have just heard. 您的浏览器不支持 audio 元素。