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以下是引用祈晴坊主在2003-10-3 22:13:00的发言: 10. Purebred cows native to Mongolia produce, on aver- age, 400 liters of milk per year; if Mongolian cattle are crossbred with European breeds, the crossbred cows can produce, on average, 2,700 liters per year. An international agency plans to increase the profita- bility of Mongolia’s dairy sector by encouraging wide- spread crossbreeding of native Mongolian cattle with European breeds.
Which of the following, if true, casts the most serious doubt on the viability of the agency’s plan? (A) Not all European breeds of cattle can be success- fully bred with native Mongolian cattle. (B) Many young Mongolians now regard cattle raising as a low-status occupation because it is less lucrative than other endeavors open to them. (C) Mongolia’s terrain is suitable for grazing native herds but not for growing the fodder needed to keep crossbred animals healthy. (D) Cowhide and leather products, not milk, make up the bulk of Mongolia’s animal product exports to Europe. (E) Many European breeds of cattle attain average milk production levels exceeding 2,700 liters.
答案选C 我选A
这个C中和 animals healthy 似乎没有任何关系的说
粗看此题我是误选了 E,不过仔细再看一下,发现其实A犯了致命的错误:都是在反对原文不可更改的事实。读文章知道削弱的对象如下: An international agency plans to increase the profita- bility of Mongolia’s dairy sector by encouraging wide- spread crossbreeding of native Mongolian cattle with European breeds. 看(A) Not all European breeds of cattle can be success- fully bred with native Mongolian cattle. 这个选项是在说引进杂交的成功性,而原文的结论是在承认已经成功引进的前提,说这样可以increase the profitability of Mongolia’s dairy sector,你看对否? 而 (E) Many European breeds of cattle attain average milk production levels exceeding 2,700 liters. 也犯了类似的错误,现在结论就是在说提高M的产量就可以了,管他欧洲的提高还是降低,对不对? 所以说这2个都是错的,A是反对原文事实,E是不切原文重点,无关。
再看看C) Mongolia’s terrain is suitable for grazing native herds but not for growing the fodder needed to keep crossbred animals healthy.
就是说你虽然可以成功引进杂交品种,可是你却没法让他健康在M存活和产奶,这就直接削弱了原文结论的可行性。
不知我的回答清楚否?
BTW,我的CR也很一般的,误导你了就别怪我了。
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