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单项选择题

网络广告收费模式中，根据广告显示次数来计算费用的收费模式是（）模式。一般网络广告平台以千次显示为一个单位，确定网络广告每显示1000次(印象)的费用。 A.
每行动成本(Cost Per Action,CPA)
B.
每购买成本(Cost Per Purchase,CPP) C.
每点击成本(Cost Per Click,CPC) D.
每千人成本(Cost Per Mille,CPM)

问答题

Debate  is a process in which at least two persons who are engaged in some kind of  conflict over ideas or actions use [填空1] to try to resolve their disagreement.