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 ______.
- the patients who are correctly diagnosed with this test as not having appendicitis invariably have medical conditions that are much less serious than appendicitis
- the misdiagnoses produced by this test are always instances of attributing appendicitis to someone who does not, in fact, have it
- all of the patients who are diagnosed with this test as having appendicitis do, in fact, have appendicitis
- every patient who is diagnosed with this test as having appendicitis has more than one of the symptoms generally associated with appendicitis
- 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
Answer: 我选C 正确答案(B) B:误诊的主要是把有病的看成没病了，而不会把没病的看成有病，所以所有开刀的都必要，即不会降低必须开刀的人数. 可以理解,正确 C:被查出有阑尾炎的实际的确有阑尾炎。这其实也是更直接陈述误诊的都是有病没查出来的而不是没病的而被开刀的。因此也不会降低必须开刀的人数. 为什么C 不对啊? | 
