原文第一段：The Hertz, Corporation, the U. S. Air Force, Hyatt Hotels Corporation, the City of Dallas, and the Neiman-Marcus Group, Inc. , have one thing in common — all have purchased the services of Feedback Plus. Feedback Plus is an agency that dispatches professional shoppers who pose as customers. These “mystery” shoppers visit the client’s business, purchase products or services and report back to the client on the quality of service they receive. The City of Dallas hired Feedback Plus to see how car-pound employees treat citizens picking up their cars. The Air Force is using professional shoppers to assess customer service at their on-base supply stores. Banks, hospitals, and public utilities are also hiring mystery shoppers. Vickie Henry, chief executive of Feedback Plus, notes that many similar firms compete for client’s business, and service really differentiates one firm from another. 

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题目1. For all of the following walks of life EXCEPT the the professional presence has been discussed in this passage.

A. economic B. military C. academic D. medical

我选的C.academic，我看网上有选B的，Air Force不就是军队吗？