单项选择题

Questions 14 to 17 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.
All of the following are solutions employed to prevent noise pollution EXCEPT ______.

A．utilizing insulation and sound proofing devices
B．reducing the sources of noises
C．wearing ear protection
D．planting more trees to absorb the noise

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单项选择题

单项选择题

Questions 14 to 17 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. All of the following are solutions employed to prevent noise pollution EXCEPT ______. 您的浏览器不支持 audio 元素。