单项选择题

Questions 8 to 10 are based on the following news. At the end of the news item, you will be given 10 seconds to answer each question. Now listen to the news. What is the main topic of the passage

A．Moods of people.
B．Sleep and dreams.
C．Effect of sleep and dreams.
D．How to manipulate dreams.

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Questions 8 to 10 are based on the following news. At the end of the news item, you will be given 10 seconds to answer each question. Now listen to the news. What is the main topic of the passage 您的浏览器不支持 audio 元素。