单项选择题

A．valuable
B．appropriate
C．convenient
D．favorite
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单项选择题
A．variousB．differentC．the higherD．the lower
A．various
B．different
C．the higher
D．the lower
单项选择题
A．attainmentsB．feasibilityC．entertainmentsD．evolution
A．attainments
B．feasibility
C．entertainments
D．evolution
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