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
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
According to the passage, the free market in secondary education _______.
A．only provides consumers with more information
B．is more competitive than the higher education market
C．means there will be more intensive competition than in colleges
D．is a real surprise to Britain's recent government
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