求解释 manhattan 例题

sharonyys · 发表于 2012-10-17 06:29:01

                                              Two genes, BRCAl and BRCA2, are linked to hereditary breast cancer. Therefore,in order to decrease the annual number of mammogram tests administered across apopulation and to more accurately assess a woman's individual risk of breast cancer,all women should be tested for these genes.
                  Which of the following is an assumption on which the argument depends?
                  (A) Some of the women who are tested for the two genes will subsequently undergomammograms on a less frequent basis than they used to.
                  (B) The majority of breast cancer patients have no family history of the disease.
(C) Researchers may have identified a third breast cancer gene that is linked with hereditary breast cancer.
(D) Women who have these genes have an 80 percent chance of getting breast cancer, while women who do not have these genes have only a lO percent chance of getting breast cancer.
(E) The presence of BRCAl and BRCA2 can explain up to 50 percent of hereditary cases.
　答案是A，但我觉得D可以improve accuracy in assessing risk诶，求教

断翎羽 · 发表于 2013-3-18 22:05:10

http://gmatclub.com/forum/two-genes-brca1-and-brca2-are-linked-to-hereditary-breast-114078.html

断翎羽 · 发表于 2013-3-18 22:05:25

这个有详细解答

lacedaemonian · 发表于 2013-3-18 22:53:54

这段话的结论是all women should be tested for these genes；得出这个结论，给出了两个原因，一是Two genes, BRCAl and BRCA2, are linked to hereditary breast cancer；二是in order to decrease the annual number of mammogram tests administered across apopulation and to more accurately assess a woman's individual risk of breast cancer。
其实这段话的难点在于in order to decrease the annual number of mammogram tests administered across apopulation and to more accurately assess a woman's individual risk of breast cancer，这句比较长的话。而这句话隐含的意思就是拿to be tested for these two genes 和原有的一种要用mammogram的检测方法做比较。比较的结果，就是得出本文的结论：all women should be tested for these genes. 而这两个方法的比较和本文的结论之间有个明显的gap, 拿就是答案A的assuption,其实可以推断出，还有另外一个assumption，那就是Some of the women who are tested for the two genes will subsequently 保be assessed more accurately than they used to.

希望能对你有帮助。其实做逻辑题，关键是要读懂文章的意思，整段文字到底想说什么，每句话是什么意思，在本段文字中起到什么作用。

求解释 manhattan 例题

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