GWD21-4， 不明白，求教！

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 have 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

还有不到一周了，脑子疲劳，转不过来了。

谢谢！

 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 have 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

还有不到一周了，脑子疲劳，转不过来了。

谢谢！

A. the patients who are correctly diagnosed with this test as not having appendicitis invariably have 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

还有不到一周了，脑子疲劳，转不过来了。

谢谢！

我观点是B.

题目意思是,这个新试验诊断起来很准确,100个里面只有两个错.那这两个错误的诊断可能有两种情况,1)有病的被诊断成没病2)没病的给诊断成有病

题目最后一句

 Clearly, using this test, doctors can largely avoid unnecessary removals of the appendix without, however, performing any fewer necessary ones than before, since

说利用这个新试验，必要的手术不会少做（即有病的不会被错诊为没病），基本避免不必要的手术（即少量情况下还是会有没病的给诊断成有病，从而做了不必要的手术），这就是符合B说的the misdiagnoses produced by this test are always instances of attributing appendicitis to someone who does not, in fact, have it 此试验的误诊总是将实际没病的人诊断成有病。

C正好是相反，而其他几个都是无关选项，什么症状跟题目都没关系，可以排除。

個人的理解......參考看看

4. 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 ______. 前提：使用新技术不会使必要动的手术量减少同时也会避免动不必要的手术　　　predict：正确面：新的技术都能够正确诊测出真的有患病的　or错误面：新的技术中的2%的误诊都是那些说病人有得病但其实没有的

A.    the patients who are correctly diagnosed with this test as not having appendicitis invariably have medical conditions that are much less serious than appendicitis　serious的程度无关

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

C.    all of the patients who are diagnosed with this test as having appendicitis do, in fact, have appendicitis　竟然也是预测中的，想一下，从正面说原因不如从反面说原因好，再看一下题目的前提是说使用新技术「不会」使必要动的手术量减少，试想一下如果新技术误诊的那2%里面都是那些实际上有却被说没有的，那么新技术就会使必要动的手术量减少，所以这个选项没有比B好

D.    every patient who is diagnosed with this test as having appendicitis has more than one of the symptoms generally associated with appendicitis　有多少symptoms无关

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　缺少多少symptoms无关