Whichof the following most logically completes the passage?
Appendicitis(inflammation of the appendix) is potentially fatal; consequently, patientswith symptoms strongly suggesting appendicitis almost always have theirappendix removed. The appropriatesurgery is low-risk but performed unnecessarily in about 20 percent of allcases. A newly developed internal scanfor appendicitis is highly accurate, producing two misdiagnoses for every 98correct diagnoses. Clearly, using this test, doctors can largely avoid unnecessary removalsof the appendix without,however, performing any fewer necessary ones than before, since______.
A. thepatients who are correctly diagnosed with this test as not having appendicitisinvariably have medical conditions that are much less serious than appendicitis B. themisdiagnoses produced by this test are always instances of attributingappendicitis to someone who does not, in fact, have it C. allof the patients who are diagnosed with this test as having appendicitis do, infact, have appendicitis D. everypatient who is diagnosed with this test as having appendicitis has more thanone of the symptoms generally associated with appendicitis E. theonly patients who are misdiagnosed using this test are patients who lack one ormore of the symptoms that are generally associated with appendicitis 完全不明白为什么选Ｂ，请ＮＮ现身解答。。
Appendicitis(inflammation of the appendix) is potentially fatal; consequently, patientswith symptoms strongly suggesting appendicitis almost always have theirappendix removed. The appropriatesurgery is low-risk but performed unnecessarily in about 20 percent of allcases. A newly developed internal scanfor appendicitis is highly accurate, producing two misdiagnoses for every 98correct diagnoses. Clearly, using this test, doctors can largely avoid unnecessary removalsof the appendix without,however, performing any fewer necessary ones than before, since______.
A. thepatients who are correctly diagnosed with this test as not having appendicitisinvariably have medical conditions that are much less serious than appendicitis==>说的是patient的病体情况和结论关于这个test的没有关系，所以是irrevalent B. themisdiagnoses produced by this test are always instances of attributingappendicitis to someone who does not, in fact, have it==>说这个test的正确性，和结论有关，放着 C. allof the patients who are diagnosed with this test as having appendicitis do, infact, have appendicitis==>说这个test的正确性，和结论有关，放着
D. everypatient who is diagnosed with this test as having appendicitis has more thanone of the symptoms generally associated with appendicitis==>同A的错误，无关 E. theonly patients who are misdiagnosed using this test are patients who lack one ormore of the symptoms that are generally associated with appendicitis==>这个选项看似有关其实无关，相当于shell game的选项，因为最后说的是patients who lack one ormore of the symptoms that are generally associated with appendicitis，并没有直接性的涉及关于test的使用正确性，我认为无关，起码要比BC弱
把B选项中的in fact去掉，意思就好理解多了the misdiagnoses produced by this test are always instances of attributing appendicitis to someone who does not have it，这种新测试方法的误诊，就是把那些没有得阑尾炎的人判成阑尾炎。 结合文章的信息，这种无中生有的误诊率在2%一下，大大低于原来的20%，并且绝不会漏掉真正得了阑尾炎的人，因而支持文章的结论：避免了不必要的手术，不影响得了阑尾炎，需要做手术的人。
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发表于 2011-8-12 23:54:47
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