单项选择题

Now listen to the following recording and answer questions 19 to 22.

A．Going to bed early.
B．Not watching TVs.
C．Using filtered glass.
D．Using eReaders.

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单项选择题

单项选择题

Now listen to the following recording and answer questions 19 to 22. 您的浏览器不支持 audio 元素。