请教GWD-TN-15，一道逻辑题

lisese

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 ______.

 

A.     the patients who are correctly diagnosed with this test as not having appendicitis invariably have medical conditions that are much less serious than appendicitis

B.      the misdiagnoses produced by this test are always instances of attributing appendicitis to someone who does not, in fact, have it

C.     all of the patients who are diagnosed with this test as having appendicitis do, in fact, have appendicitis

D.     every patient who is diagnosed with this test as having appendicitis has more than one of the symptoms generally associated with appendicitis

      E.   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

答案是B，不理解。

SHJDHKBB9

B唯一的误诊是把有阑尾炎的病人诊断为没有不就不需要为该病人手术移除阑尾,因而也就Clearly, using this test, doctors can largely avoid unnecessary removals of the appendix without, however, performing any fewer necessary ones than before.

lisese

又是SHJDHKBB9回答了偶的问题。。。

THANKS A LOT！！！

铁甲

这个题是阅读题。。好不容易绕过来，题目问，这个测试方式减少了不必要的手术，但是不减少必要的手术。那么必然要排除这种情况：2%的误诊病人中有一些真的是需要手术的患者。b排除了这种情况。

sunluning0

谢谢铁甲阿，我原来一直问题没读懂啊