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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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.
单项选择题
What might be the author's attitude towards competitions between nearby schools
A．The author is in favor of various kinds of competition.
B．The author is indifferent to any competition and its result.
C．The author is not certain of the effect of competitions.
D．The author is against inter-collegiate competitions.
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