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题库 / GMATLA-CR-73
Which of the following most logically completes the passage?
Appendicitis (inflammation of the appendix) is potentially fatal; consequently, patients with symptoms strongly suggesting appendicitis almost always have their appendix removed. The appropriate surgery is low-risk but performed unnecessarily in about 20 percent of all cases. A newly developed internal scan for appendicitis is highly accurate, producing two misdiagnoses for every 98 correct diagnoses. Clearly, using this test, doctors can largely avoid unnecessary removals of the appendix without, however, performing any fewer necessary ones than before, since ______.
the patients who are correctly diagnosed with this test as not having appendicitis invariably have medical conditions that are much less serious than appendicitis
the misdiagnoses produced by this test are always instances of attributing appendicitis to someone who does not, in fact, have it
all of the patients who are diagnosed with this test as having appendicitis do, in fact, have appendicitis
every patient who is diagnosed with this test as having appendicitis has more than one of the symptoms generally associated with appendicitis
the only patients who are misdiagnosed using this test are patients who lack one or more of the symptoms that are generally associated with appendicitis
这题花了6分钟猜对了，但我觉得一个都不对，看了大家的分享仍然不懂！！
before：假设实际手术量100人＝有症状有病的80＋有症状没病的20
after：现在手术量要>=100人 = 98%确诊有病的＋b条件：剩下2％是没病也确诊的的
隐含的意思是，before可能实际有病没症状的都不手术，after有病没症状的都确诊了？？
B 那里是误诊 不是确诊的（也就是说即使误诊了的也是没有阑尾的人，所以不用做手术-------对比原来误诊的可能没病也拉你去做手术了）所以即使误诊存在，医生necessary做手术的量也没有增多
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