单项选择题

Questions 4 to 7 are based on the following conversation. At the end of the conversation, you will be given 20 seconds to answer the questions.
Now listen to the conversation.
How long one should take mild exercise a day to increase one’s life span

A．Half an hour.
B．One hour.
C．Two hours.
D．45 minutes.

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单项选择题

单项选择题

Questions 4 to 7 are based on the following conversation. At the end of the conversation, you will be given 20 seconds to answer the questions. Now listen to the conversation. How long one should take mild exercise a day to increase one’s life span 您的浏览器不支持 audio 元素。