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【多选题】
关于抽样说法正确的是()A.
抽样是科学实验、质量检验、社会调查普遍采用的一种经济有效的工作和研究方法
B.
根据一定的程序规则，从研究总体中抽取一部分进行观察，由此获得有关总体的信息
C.
其基本要求是要保证所抽取的样品单位对全部样品具有充分的代表性
D.
其目的是通过被抽取样品单位的分析、研究结果来估计和推断全部样品的特性
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【简答题】Because he was caught in a heavy rain, he was all wet. → , he was all wet.
【单选题】He was caught in the heavy rain.That’s ___ he was ill.
A.
how
B.
which
C.
why
D.
what
【单选题】The reason _______ he was late again was that he was caught in a traffic jam.
A.
which
B.
in which
C.
for which
D.
of which
【简答题】He was caught in a heavy rain. He was all wet.
【单选题】The reason ______ he was late again was that he was caught in traffic jam in the rush hour. [ ]
A.
which
B.
in which
C.
for which
D.
of which
【单选题】The reason _______ he was late again was that he was caught in a traffic jam in the rush hour.
A.
which
B.
in which
C.
for which
D.
of which
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