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【单选题】
若样本中各个数值都扩大2倍,而次数都减少为原来的1/4,则其算数平均数( )。A.
扩大2倍
B.
减少到1/2
C.
减少为1/4
D.
不变
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举一反三
【单选题】What is the irony about the debate over immigration?
A.
Even economists can't reach a consensus about its impact.
B.
Those who are opposed to it turn out to benefit most from it.
C.
People are making too big a fuss about something of small impact.
D.
There is no essential difference between seemingly opposite opinions.
【单选题】All visitors are requested to ______ with the regulations.
A.
comply
B.
agree
C.
consist
D.
consent
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