单项选择题


A．of
B．to
C．on
D．in
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单项选择题
A．decisiveB．determinantC．essentialD．crucial
A．decisive
B．determinant
C．essential
D．crucial
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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