单项选择题

Questions 1 to 5 are based on a conversation. At the end of the conversation you will be given 10 seconds to answer each of the following five questions. Now listen to the conversation.
When does dreaming occur

A．During passive sleep.
B．During active sleep
C．Between passive sleep and active sleep
D．After active sleep.

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单项选择题

单项选择题

Questions 1 to 5 are based on a conversation. At the end of the conversation you will be given 10 seconds to answer each of the following five questions. Now listen to the conversation. When does dreaming occur 您的浏览器不支持 audio 元素。