单项选择题

Questions 14 to 16 are based on the following passage. At the and the passage, you will be given 15 seconds to the questions. Now listen to the passage.

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问答题
[听力原文]DICTATIONIt’s clear that everyone needs to sleep. Most people rarely think about how and why they sleep, however. We know that if we sleep well, we feel rested. If we don’t sleep enough,, we often feel tired and irritable. It seems there are two purposes of sleep: physical rest and emotional and psychological. rest. We need to rest our bodies and our minds. Both are important in order for us to be healthy. Each night we alternate between two kinds of sleep: active sleep and passive sleep. The passive sleep gives our body the rest that’s needed and prepares us for active sleep, in which dreaming occurs.Through the night, people alternate between passive and active sleep. The brain rests, then it becomes active, then dreaming occurs. This cycle is repeated several times through the night. During eight hours of sleep people dream for a total of one and half hours on the average.
单项选择题
What is the main subject of the conversation
A．The man’s last appointment.
B．Professor Irwin’s office hours.
C．Student advisement during registration.
D．The man’s health problems.
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