问一道逻辑题 Appendicitis

gwinyu

Appendicitis                                                                    
Which of the following most logically completes the passage?
Appendicitis (inflammation of the appendix) is potentially fatal;consequently, patients with symptoms strongly suggesting appendicitisalmost have their appendix removed. The appropriate surgery is low-riskbut performed unnecessarily in about 20 percent of all cases. A newlydeveloped internal scan for appendicitis is highly accurate, producingtwo misdiagnoses for every 98 correct diagnoses. Clearly, using thistest, doctors can largely avoid unnecessary removals of the appendixwithout, however, performing any fewer necessary ones than before,since .


A. the patients who are correctly diagnosed with this test as nothaving appendicitis invariably have medical conditions that are muchless serious than appendicitis
B. the misdiagnoses produced by this test are always instances ofattributing 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 appendicitishas more than one of the symptoms generally associated with appendicitis
E. the only patients who are misdiagnosed using this test are patientswho lack one or more of the symptoms that are generally associated withappendicitis

zcool

这题我也错了，现在看下来，B最好。C没有说误判的情况，without, however, performing any fewer necessary ones than before，说明很多手术还是做了，只是误判率下降了。

sachiel87

显然选B

fearfree

阑尾炎潜在性的致命。。经常建议被切除。。有20%的case是并无必要的被切除。。新方法。。2%的错误率。。适用此方法可以大量避免不必要的切除而又不至于做少必要的切除手术，由于:
（不少做必要手术，就是必须切的都切了，诊断错的情况只有不必须切的也切了-此为2%）

A；正确诊断认为无阑尾炎的人都有比阑尾炎更不严重的医学症状--证明正确诊断无病的有效性而已
B；误诊常常是认为没有阑尾炎的人有阑尾炎  --比较能解释括号内的解读内容，不必须切的也切了

C；所有的确诊都确实是有阑尾炎 很迷惑人，但不能说明没确诊的不是阑尾炎，题目表明该切的都切了。所以我排出这个
D；每个确诊都有多于一个与阑尾炎相关的症状  相关性不强
E；唯一的误诊是缺少1个或者以上与阑尾相关的症状 相关性不强而且，唯一？

本题误导很厉害，请指教