4. GWD21-Q4:
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
原文说：阑尾炎一般都是外科手术开刀切除，但是外科手术开刀却执行了20%的不必要的手术====》言下之意就是多开刀了，把那些不需要做手术的患者也一起开刀了。。那么==》开刀的人数是人多。
现在有一个技术test能scan出真正的阑尾炎，误诊是98个里面只有2个。。相当的精确。==》应该得到的结论就是开刀的人少了，因为test让医生只开那些真正需要做手术的人了。
结论：结果是test下的开刀的人竟然和以前误诊很高的外科开刀的人数差不多多？解释原因
B的说法是test下面的误诊往往都是把实际上有阑尾炎的人当作不必要给排除了，也就是说这些病人其实最后是需要开刀的。。
可是我有一个疑问啊，只有2/98的误诊，在怎么做手术，也比以前开错20%的误诊的人数少吧？请指教
结论：结果是test下的开刀的人竟然和以前误诊很高的外科开刀的人数差不多多？解释原因
结论：结果是test下的开刀的人竟然和以前误诊很高的外科开刀的人数差不多多？解释原因
不是这个意思吧？
顶楼上
终于看懂了，thx!
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