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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
complete：注意需要complete的部分是什么：
可以很大程度的减少不必要的手术，并且不少做任何一场必要的手术，因为____
新方法还有2%的失败率，怎么会这样呢？
注意两个表述概率的词：
largely avoid unnecessary removals ；
without performing any fewer ones than before.
误诊的情况可能是：将有病的人诊断成没有病，将没病的人诊断成有病。
对应1，有必要的手术还是会变少。对应2，有必要的手术不会变少，没必要的手术也会减少18%。
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