下列属于横向研究的是
A.趋势研究
B.同期群研究
C.市场调查
D.同组研究
正确答案是C
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Complete each of the following sentences with a (compound) word derived from the one(s) given in brackets.
Just like diseases of the body, bad habits and vices of the mind are more ( )prevented than cursed. (easy)