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Questions 32 to 35 are based on the passage you have just heard.

A．To keep your eyes a bit drier.
B．To protect your eyes from infection,
C．To cry for your sadness only.
D．To conceal your happiness.

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单项选择题

Questions 32 to 35 are based on the passage you have just heard. 您的浏览器不支持 audio 元素。