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【单选题】
抽样平均数的抽样平均误差（ ）A.
是样本平均数的离差
B.
是样本平均数的平均数
C.
是样本平均数和样品成数的标准差
D.
与样本平均数没有关系
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【单选题】_____ I am concerned, Peru is well worth a visit.
A.
Even if
B.
In my opinion that
C.
As is known that
D.
As far as
【单选题】Your company pays attention to the staff’s health. In my opinion, that’s a benefit .
A.
with a long time
B.
in the long run
C.
for a long run
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【单选题】I'm not sorry he's in prison.In my opinion he got what he _____. [ ]
A.
preserved
B.
deserted
C.
deserved
D.
reserved
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