除非针对特别大规模的总体或者有某些特殊的要求,对于一般性的社会调查,样本规模一般不要超过()
A.50人
B.500人
C.2500人
D.100000人
正确答案是C
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Complete each of the following sentences with a compound word derived from the one given in brackets.
They have been through a lot together in their fifty years of ( ). (marry)
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