单项选择题

A．fields
B．scopes
C．categories
D．ranges
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单项选择题
A．uniformityB．comparisonC．differentiationD．marriage
A．uniformity
B．comparison
C．differentiation
D．marriage
单项选择题
A．becauseB．whenC．thoughD．if
A．because
B．when
C．though
D．if
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