单项选择题

Questions 19 to 22 are based on the passage you have just heard.
What’s the topic discussed in this passage

A．Why people hold back their tears.
B．Why people cry.
C．How to restrain one’s tears.
D．How tears are produced.

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单项选择题

Questions 19 to 22 are based on the passage you have just heard. What’s the topic discussed in this passage 您的浏览器不支持 audio 元素。