单项选择题

According to the author, all animals ______.

A．spend some time resting
B．close their eyes when sleeping
C．are good sleepers
D．are poor sleepers
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单项选择题
Animals that are good sleepers ______.
A．need to have a good sleep after they have exhausted themselves by getting rid of hunting animals
B．need to have a good sleep after they get tired from hunting other animals
C．are all mammals
D．almost always have a safe resting place
单项选择题
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
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