单选题
The statement," Horses and cows, for example, rarely close their eyes" aims to show that ______.
A、
these animals rarely need any rest
B、
they almost always keep alert to danger
C、
they often stay awake
D、
their eyes are rarely closed even when they are asleep
【正确答案】
D
【答案解析】
作者在第二段说，马和牛很少闭上眼睛，但这并不能说明它们不睡觉。事实上它们睡觉的时候眼睛经常是睁开的。
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