题目

阅读理解Do you love bacon(熏猪肉)? Who doesn't, right? From time to time, you may have heard thephrase bring home the bacon. Did you ever wonder what that means?Actually, bring home the baconis a common phrase used to mean to earn money. If you're bringinghome the bacon, you're making money to bring home to your family. So howis the meat connected with making money?One popular story holds that the phraseappeared in the 1100s in a small town of Great Dunmow in England. The church(教堂) in Great Dunmow would give a rasher of bacon as a reward to anyman who could honestly say that he had过敏反应的发生往往是由于人体（　　） A、免疫监视功能过强B、自身稳定功能过强C、特异防御机能过强D、免疫机能过弱