According to the author, many people don't know________.A、they are in business to give benefits to their customers
B、they are in business to offer services to their customers
C、where and how to identity their customers' needs
D、when and why their customers spend their money
【正确答案】：A
【题目解析】： 细节判断题。根据题干定位关键信息在第六段。文章提到，大多数跟人打交道的人并不真的明白他们从事的是什么工作。多数人认为他们做的是提供某种产品和服务的工作，却不知道他们干的是给人带来好处的工作（They don't knowthey're in business to give benefits to people）。因此答案A是正确选项。