在网上看到的一道题，不晓得具体来源，大家看看吧
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 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
题：阑尾炎是潜在致命的，结果，有阑尾炎症状的病者都会切除阑尾。这个手术时低风险的，但是其中有20%都是不必要的手术。一个新发明机器可以高精确的诊断阑尾炎，只有2%的误诊。有了这种机器，医生可以在不减少必要手术的同时，避免不必要的阑尾切除，因为____
B 这个机器做出的误诊都是把没有患阑尾炎的患者归结为阑尾炎患者
C 所有被机器认为换阑尾炎的患者，都换了阑尾炎
Clearly, using this test, doctors can largely avoid unnecessary removals of the appendix without, however, performing any fewer necessary ones than before 可以理解为 新技术可以在减少不必要手术（没病诊断有病）的同时，不减少必要的手术(有病诊断没病) 。
