请教JJ,阑尾炎

xiearmyxiearmy

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________________
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

据说选B,但我以为选C

weiyu

The misdiagnosis happens in those who, in fact, do not have the appendicitis. It is a false positive sympotom.

To be discussed....

dashasha

应该选B。这道题可以这样理解，原题说，新的方法正确诊断率是98%，误诊率是2%，结论是新方法减少了错误的割除，而且大大减少了真正要动手术的例子。那么，你想，怎么才能减少要动手术的例子呢？只有B，说用新方法得出错误结论的都是没得澜尾炎的人，那么我们就可以用新方法当筛选方法，把所有新方法结果是NEGATIVE的踢出去就可以了，因为他们肯定没得病。C选项只说明了查出POSITIVE的人都是真的得病的人，那么你想，如果结果是NEGATIVE，你是动手术还是不动呢？不动呢，万一真的得病就死了，所以还是需要动手术，那么新方法又有什么用处呢？反正不管POSITIVE，NEGATIVE都得动手术。

littlestone

The answer B:the misdiagnoses produced by this test are always instances of attributing appendicitis to someone who does not, in fact,have it.

这句话的意思是错误的诊断是把没有病的人诊断成有病呢，还是把有病的诊断成没有病呢？

这个 in fact 在此指的是什么是事实呢？

cranberry

C是不正确的，按C的解释，所有诊断为有的人都有，那么错误一定发生在诊断为无实际上是有的情况下，换言之，有些必要的手术被取消了。来看文章，文章说，以前是经常对没有必要进行手术的人进行了手术，而现在是很大程度上减少了不必要的手术，同时必要的手术没有比以前少，也可以理解为，该做的都做了。我们再来看B，所有的误诊发生都是把没有病的诊断为有病，所以错的原因还是做了不该做的手术，符合文章的逻辑。

buddyk

顶上去

lifelover

支持Ｂ

lawyer_1

显然答案为B。HOWEVER后面那句话的意思为：该切除的都切除了。那末产生这种效果的原因应该是该切除的都给SCAN出来了。即B。C的意思是查出有阑尾炎的实际都有。那末查出没有的呢，是不是有些实际也有，如果是，则该切除的没切除。所以不是答案。

Lucky0506

the misdiagnoses produced by this test are always instances of attributing appendicitis to someone who does not, in fact, have it

请问，这一句，in fact, have it? 到底怎么理解啊？

howardwang

很显然是B