单项选择题

A．out
B．in
C．up
D．down
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单项选择题
A．flexibilityB．distinctionsC．variationsD．alterations
A．flexibility
B．distinctions
C．variations
D．alterations
单项选择题
A．greatlyB．orderlyC．especiallyD．mainly
A．greatly
B．orderly
C．especially
D．mainly
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