单项选择题

Questions 17 to 20 are based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions. Now, listen to the passage. Which of the following can best served as the title of the passage

A．The Cause of Air Pollution.
B．The Issue of Air Pollution.
C．The Types of Air Pollution.
D．The Prevention of Air Pollution.

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单项选择题

单项选择题

Questions 17 to 20 are based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions. Now, listen to the passage. Which of the following can best served as the title of the passage 您的浏览器不支持 audio 元素。