单项选择题

Questions 14-17 are based on a talk between a student and his advisor
Why is blinking important, according to the conversation

A．Ithelps to keep the eyes fired．
B．It helps to keep the eyes moist．
C．It causes eyes to move fast．
D．Ithelps to clean the eyes．

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单项选择题

单项选择题

Questions 14-17 are based on a talk between a student and his advisor Why is blinking important, according to the conversation 您的浏览器不支持 audio 元素。