单项选择题

Questions 15 to 17 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.
When did the technique of hearing test become standardized

A．Two years ago.
B．Three years ago.
C．Five years ago.
D．A decade ago.

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单项选择题

单项选择题

Questions 15 to 17 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. When did the technique of hearing test become standardized 您的浏览器不支持 audio 元素。