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公共产品论(theory of public goods)
公共产品论(theory of public goods)
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公共产品论(theory of public goods)
The aging of American Society has resulted in ______.
A.people's greater concern about public health care
B.old people's increasing interests in high-tech goods
C.more crimes being committed by senior citizens
D.communities' growing overlook of education
A.中性效应
B.激励效应
C.阻碍效应
D.替代效应
The word approach we mean that an idea or theory is being applied.()
B.motivating factors
C.security factors
D.social factors