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

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热门试题

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

单项选择题

The example of dogs and cats in the second paragraph is intended to ______.

A．explain which animals are mammals
B．show the differences between mammals
C．illustrate how shallow dreamless sleep is
D．reveal how smart they are