单项选择题


A．flexibility
B．distinctions
C．variations
D．alterations
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单项选择题
A．dramaticB．gradualC．swiftD．marked
A．dramatic
B．gradual
C．swift
D．marked
单项选择题
A．retainingB．settlingC．maintainingD．preserving
A．retaining
B．settling
C．maintaining
D．preserving
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