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【单选题】
简单随机抽样又称为( )A.
抽签抽样
B.
随机数表抽样
C.
纯随机抽样
D.
等距随机抽样
E.
不等距随机抽样
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举一反三
【单选题】I'll come when you are _______ help.
A.
on need of
B.
in need of
C.
at need for
D.
in need
【单选题】I need help _____my English,but I can help you______your Chinese.
A.
for,with
B.
for,for
C.
with,for
D.
with,with
【单选题】I couldn’t______cry while I was watching the movie “Titanic”.
A.
help to
B.
help
C.
help but to
D.
help but
【单选题】The magician picked several people______from the spectators and asked them to help him with the performance.
A.
by chance
B.
at random
C.
on occasion
D.
on average
【单选题】My cousin Mary is often in a poisonous mood; I suppose it's because she is ______ child.
A.
one
B.
a unique
C.
a single
D.
an only
【简答题】A． Take pride in B． Talk about C． Help with D． Talk to
【单选题】---Is Kate serious? ---I _________. She never means it. [ ]
A.
suppose
B.
agree
C.
believe
D.
wonder
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