单项选择题

It can be inferred from the passage that the following events occurred the earliest is ______.

A．the writing of Republic
B．Freud' s study
C．the discovery of D-state
D．Aserinsky' s research
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单项选择题
The author considers our understanding of dreaming someday ______.
A．imaginary
B．likely
C．suspicious
D．inevitable
单项选择题
According to the author, green-space facilities should be designed in such a way that ______.
A．more obligatory activities might take on a recreative aspect
B．more and more people might have access to them
C．an increasing number of recreative activities might be developed
D．recreative activities might be brought into our homes
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