单项选择题

Questions 29 to 31 are based on the passage you have just heard.

A．To help solve their psychological problems.
B．To play games with them.
C．To send them to the hospital.
D．To make them aware of its harmfulness.

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单项选择题

单项选择题

Questions 29 to 31 are based on the passage you have just heard. 您的浏览器不支持 audio 元素。