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参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】Thanks to the GPS, the apps on your phone have long been able to determine your general location. But what if they could do so with enough precision that a supermarket, say, could tempt you with digit...
A.
rewards programs
B.
physical stores
C.
profitable insight
D.
shopping habits