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【单选题】
根据统计性歧视模型，随着群体中成员的差别减少，使用群体资料作为甄别手段的代价将会（）A.
降低
B.
不变
C.
增大
D.
无法确定
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举一反三
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A.
a; that
B.
a; when
C.
the; that
D.
the; when
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【单选题】_________ ,we have to get down to business right away.
A.
As there was no time left
B.
There is no time left
C.
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D.
There to be no time left
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A.
spend
B.
save
C.
take
D.
lose
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A.
which
B.
on which
C.
what
D.
when
【单选题】You needn’t have ________ the speaker when he was speaking; there was enough time afterwards for you to ask questions.
A.
affected
B.
interrupted
C.
involved
D.
disturbed
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