单选题
________，businesses offer services for which they charge a fee that is based on the number of transactions they process．
A、
In the fee-for-transaction revenue model
B、
In the web catalog revenue model
C、
In the traditional catalog-based retail revenue model
D、
In the advertising-supported revenue model
【正确答案】
A
【答案解析】
在交易费用收入模型中，企业根据他们在提供服务时所处理的事务大小和数量来收取一定的费用。
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