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【单选题】
下列判断正确的是（ ）A.
a+b一定大于a-b
B.
若-ab＜0，则a、b异号
C.
若a=b，则a 3 =b 3
D.
若a≠b，则a 2 一定不等于b 2
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举一反三
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A.
you have to make your complete sales presentation in that time
B.
the prospect may not have enough time to talk to you
C.
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D.
you may be nervous when you meet the prospect
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【单选题】Is it he or you________in charge of the job and supposed to complete it punctually? [ ]
A.
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B.
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C.
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D.
whom are
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