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题库 / GMATLA-CR-73
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
There are two types of misdiagnoses the test could make:
1.) Diagnose appendicitis when the patient doesn't have it
2.) Diagnose nothing when the patient does have appendicitis.
In order to make sure they aren't missing any necessary surgeries, they need to eliminate #2.
重点在：without performing any fewer necessary ones than before，必要做手术的一个不会减少，不必要的是largely avoid
B. 错误的检测都是attributing appendicitis to someone who does not have it (把没得病的人检测成了得病需要手术的人)，所以不会误诊真正得了病需要手术的人
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