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.
According to the research by NASA, an afternoon nap ______.

A．can greatly improve the efficiency of work
B．can fall into a deep sleep and will wake up groggy
C．makes people suffer a decline in their alertness
D．is an admission of weakness

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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. According to the research by NASA, an afternoon nap ______. 您的浏览器不支持 audio 元素。

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.
According to the research by NASA, an afternoon nap ______.