单项选择题

Questions 14 and 17 are based are the following passage. At the end of the passage, you will be given 20 seconds to answer the questions.
Now listen to the passage.
The speaker worried more about ______ pollution.

A．light
B．water
C．sound
D．air

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单项选择题

单项选择题

Questions 14 and 17 are based are the following passage. At the end of the passage, you will be given 20 seconds to answer the questions.Now listen to the passage. The speaker worried more about ______ pollution. 您的浏览器不支持 audio 元素。