[求助] 急急，有关阅读JJ 29 考 在线等待

sendme

i'll choose b for the first one.E for second..

hgconnie

B对。C不对。

注意题干最后一句话，说A newly developed internal scan for appendicitis is highly accurate,可以减少不必要的诊断错误，B正好说的是一种错误。C说的人诊断出来有病实际也是有病，没有错误。

ninanina

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 ______.

 阑尾炎是致命的。一般来说阑尾炎患者都会摘除阑尾。摘除阑尾的手术风险很低但其实在20%的case里面是不必要的。一项新发明的阑尾内部扫描技术是高度精确的 - 每100个诊断里只有2个误诊。也就是说，医生使用这项技术将会避免不必要的阑尾摘除，同时保证摘除需要摘除的阑尾（一句话，保证阑尾是否需要摘除的诊断的正确性）

 阑尾炎是致命的。一般来说阑尾炎患者都会摘除阑尾。摘除阑尾的手术风险很低但其实在20%的case里面是不必要的。一项新发明的阑尾内部扫描技术是高度精确的 - 每100个诊断里只有2个误诊。也就是说，医生使用这项技术将会避免不必要的阑尾摘除，同时保证摘除需要摘除的阑尾（一句话，保证阑尾是否需要摘除的诊断的正确性）

1. the patients who are correctly diagnosed with this test as not having appendicitis invariably have medical conditions that are much less serious than appendicitis
           
2. the misdiagnoses produced by this test are always instances of attributing appendicitis to someone who does not, in fact, have it
           
3. all of the patients who are diagnosed with this test as having appendicitis do, in fact, have appendicitis
           
4. every patient who is diagnosed with this test as having appendicitis has more than one of the symptoms generally associated with appendicitis
           
5. 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

很明显，题干里的misdiagnoses是指"whether a patient with Appendicitis needs to remove his/her appendix", 而不像B里讨论的，是"attributing appendicitis to someone who doesn't have it"

之所以选择C是因为，C保证了所有的病人被判阑尾炎的诊断都是对的，都不是误判，这是接下来他被新技术判断是否需要摘除阑尾的推论的基础。

麻烦几位再看看，我始终想不明白。