皮亚杰所提出的影响个体认知发展的主要因素不包括 （）
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[A] for[B] to[C] with[D] of
[A] price[B] value[C] interest[D] fun
One advantage of CD-RWs is that they can________like floppy disks．
Early astronomers believed that the sky was a crystal shell or series of crystal shells because________
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