version2Which 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 having 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
B?
support C!
选B
理由：提干中“using this test, doctors can largely avoid unnecessary removals of the appendix without, however, performing any fewer necessary ones than before”表明使用这种检查后，医生可以比以往在更大程度上避免不必要的阑尾手术，同时又不会错过任何必须的阑尾手术。言下之意，这种检查有时可能会将非阑尾炎的患者误诊为阑尾炎的患者，却绝不会将阑尾炎的患者诊断为非阑尾炎的患者。这与B项的意思相符。
C 意为所有这种检查诊断为阑尾炎的患者都是事实上的阑尾炎患者。这就是说，这种检查有时可能会将阑尾炎的患者误诊为非阑尾炎的患者，却绝不会将非阑尾炎的患者诊断为阑尾炎的患者。这样就与提干发生了冲突。
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