单项选择题

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

A．They are active during the day.
B．They are active at night.
C．They are sensitive to light.
D．They can be easily separated.

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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。