单项选择题

Questions 11 to 14 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.
How long will be the optimal span of the nap

A．About three quarters.
B．No more than an hour.
C．Less than half an hour.
D．Fifteen minutes.

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单项选择题

单项选择题

Questions 11 to 14 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. How long will be the optimal span of the nap 您的浏览器不支持 audio 元素。