Twenty years ago the Republic of Rosinia produced nearly 100 million tons of potatoes, but last year the harvest barely reached 60 million tons. Agricultural researchers, who have failed to develop new higher yielding strains of potatoes, are to blame for this decrease, since they have been concerned only with their own research and not with the needs of Rosinia. Which one of the following is an assumption on which the argument depends? (A) Any current attempts by agricultural researchers to develop higher-yielding potato strains are futile. (B) Strains of potatoes most commonly grown in Rosinia could not have produced the yields last year than they once did. (C) Agricultural researchers often find concrete solutions to practical problems when investigating seemingly unrelated questions. (D) Wide fluctuations in the size of the potato crop over a twenty-year period are not unusual. (E) Agricultural research in Rosinia is funded by government grants
对B取非: Strains of potatoes most commonly grown in Rosinia could have produced the yields last year than they once did. 说明去年土豆产量下降是别的原因造成的， 错不在strains of potatoes, 自然错也就不在researcher, 与原文结论相反。
对D取非，Wide fluctuations in the size of the potato crop over a twenty-year period are unusual。 说明 common strains of potatoes 本身一般不会出现产量大幅减少问题，那么并不能排除是Agricultural researcher 的问题呀，应该不是weaken 吧。
Twenty years ago the Republic of Rosinia produced nearly 100 million tons of potatoes, but last year the harvest barely reached 60 million tons. Agricultural researchers, who have failed to develop new higher yielding strains of potatoes, are to blame for this decrease, since they have been concerned only with their own research and not with the needs of Rosinia.
Which one of the following is an assumption on which the argument depends?
(A) Any current attempts by agricultural researchers to develop higher-yielding potato strains are futile. “取非”，即使有一部分现在的努力是有用的，但是不能说明他们过去的问题，无法削弱（注意文中的现在完成时态）
(B) Strains of potatoes most commonly grown in Rosinia could not have produced the yields last year that they once did. “取非”，如果他们能够恢复过去的产量，那么削弱结论
(C) Agricultural researchers often find concrete solutions to practical problems when investigating seemingly unrelated questions.
(D) Wide fluctuations in the size of the potato crop over a twenty-year period are not unusual.（B）
(E) Agricultural research in Rosinia is funded by government grants.
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发表于 2003-11-23 17:24:00
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