皮皮学，免费搜题
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【多选题】
抽样调查中的抽样误差是A.
是不可避免要产生的
B.
是可以通过改进调查方法来避免的
C.
是可以计算出来的
D.
只能在调查结果之后才能计算
E.
其大小是可以控制的
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举一反三
【单选题】— When did you finish _____ your homework? — I finished it at 9:00 last night. [ ]
A.
do
B.
to do
C.
did
D.
doing
【单选题】He________go to bed_______he finished his homework.
A.
doesn’t; until
B.
doesn’t; and
C.
didn’t; until
D.
didn’t; for
【简答题】Homework has never been terribly popular with students and even many parents, but in recent years it has been particularly scorned. School districts across the country, most recently Los Angles Unifie...
【单选题】---I have finished my homework. ---___________.Let’s go to play tennis.
A.
So have I
B.
I have so
C.
So did I
D.
So you do
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