单项选择题

Which of the following might be the best title for this passage

A．Evolution of Sleep.
B．Two Types of Sleep.
C．The Original Function of Sleep.
D．Animals and Sleep.
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单项选择题
Predators are ______.
A．able to prey even when they are in deep dream sleep
B．more likely to experience dream sleep
C．incapable of preying when immobilized by dreamless sleep
D．good at preying on stupid animals
单项选择题
Compare with dreamless sleep, deep dream sleep is ______.
A．not the result of natural selection
B．less likely to appear to moneys
C．more protective to the animals
D．at a higher stage of evolution
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