单项选择题

A．valuable
B．appropriate
C．convenient
D．favorite
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单项选择题
A．regulationsB．formationsC．rules formationsD．constitutions
A．regulations
B．formations
C．rules formations
D．constitutions
单项选择题
A．variousB．differentC．the higherD．the lower
A．various
B．different
C．the higher
D．the lower
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