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【单选题】
对总体中全部个体编号，采用抽签、摇号、随机数字表等方法确定中选号码，相应的个体为样品。这种方法为( )。A.
纯随机抽样
B.
分层抽样
C.
等距抽样
D.
整群抽样
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【简答题】A．It took her the first seven years. B．It took her four years. C．It took her a good three years. D．It took her six years.
【单选题】It ______ the Chinese people many years to build the Great Wall. [ ]
A.
spends
B.
costs
C.
paid
D.
took
【单选题】He didn’t succeed overnight. On the contrary, it was many years ______ his career took off.
A.
since
B.
that
C.
before
D.
after
【单选题】Many great changes _____ in Beijing in these years. [ ]
A.
took place
B.
have taken place
C.
have been taken place
D.
have happened
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