112. In tests for pironoma, a serious disease, a false positive result indicates that people have pironoma when, in fact, they do not; a false negative result indicates that people do not have pironoma when, in fact, they do. To detect pironoma most accurately, physicians should use the laboratory test that has the lowest proportion of false positive results. Which of the following, if true, gives the most support to the recommendation above?
(A) The accepted treatment for pironoma does not have damaging side effects.
(B) The laboratory test that has the lowest proportion of false positive results causes the same minor side effects as do the other laboratory tests used to detect pironoma.
(C) In treating pironoma patients, it is essential to begin treatment as early as possible, since even a week of delay can result in loss of life.
(D) The proportion of inconclusive test results is equal for all laboratory tests used to detect pironoma.
（E）All laboratory tests to detect pironoma have the same proportion of false negative results.
正确答案是E,OG的解释是：The given recommendation is to use the test that least often indicates a false positive. What therefore needs to be true about the accuracy of all the laboratory tests? If the proportion of false positives is the determining variable in the choice of the most accurate test, then the different tests for the disease must have the same proportion of false negative results. Thus, the test that leads to the lowest proportion of false positive results must have the fewest false results overall and must give the most accurate results of all the tests. 为什么出现the same proportion of false negative results时就能表明是the fewest false results?这个逻辑我没有想明白？NN们解释一下吧。。。这个问题会不会太白了。。。。
104 ·The cost of producing radios in Country Q is 10 percent less than the cost of producing radios in Country Y. Even after transportation fees and tariff charges are added, it is still cheaper for a company to import radios from Country Q to Country Y than to produce radios in Country Y.
The statements above, if true, best support which of the following assertions? (A) Labor costs in Country Q are 10 percent below those in Country Y. (B) Importing radios from Country Q to Country Y will eliminate 10 percent of the manufacturing jobs in Country Y.
(C) The tariff on a radio imported from Country Q to Country Y is less than 10 percent of the cost of manufacturing the radio in Country Y.
(D) The fee for transporting a radio from Country Q to Country Y is more than 10 percent of the cost of manufacturing the radio in Country Q.
E) It takes 10 percent less time to manufacture a radio in Country Q than it does in Country Y.
Reasoning ：What conclusion can be drawn from this information? Because production costs are 10 percent higher in Country Y than in Country Q importing radios is less expensive only if the combined costs of tariffs and transportation are less than 10 percent of the manufacturing costs.
If the proportion of false positives is the determining variable in the choice of the most accurate test, then the different tests for the disease must have the same proportion of false negative results
始终没有读懂这句话的意思、、
这难道就能符合你说的，固定其中各一个因素吗？我没有明白你所指的因素分别是文章提到的哪些？
谢谢啦。。。。。作者: 水色青空 时间: 2009-11-19 17:02
第二题明白了，谢谢你呀
非常感谢~~作者: 水色青空 时间: 2009-11-19 17:03
恩，明白了
104这种题目一般你们都怎么做呢？感觉很容易错，也很容易思维混乱啊。。。作者: turn55 时间: 2009-11-19 20:56
两个因素（文中提到的两种错误）： 1. a false positive result 2. a false negative result
这两个因素 都要小 实验结果 才能好 选E 代入原文 就是说 在 a false negative result 比例一样的情况下 如果 a false positive result的比例 越小 那么实验结果 就会越好作者: 水色青空 时间: 2009-11-20 08:25
I GOT IT.