Scientists have made genetic modifications to cotton to increase its resistance to insect pests.According to farmers’ report, the amount of insecticide needed per acre to control insect pests was only slightly lower for those who tried the modified seed than for those who did not.Therefore, since the modified seed costs more than ordinary seed without producing yields of higher market value, switching to the modified seed would be unlikely to benefit most cotton farmers economically.
Which of the following would it be most useful to know in order to evaluate the argument?
A. Whether the insecticides typically used on ordinary cotton tend to be more expensive than insecticides typically used on other crops
B. Whether for most farmers who grow cotton it is their primary crop
C. Whether the farmers who have tried the modified seed planted as many acres of cotton, on average, as farmers using the ordinary seed did
D. Whether farmers who tried the modified cotton seed had ever tried growing other crops from genetically modified seed
E. Whether most of the farmers who tried the modified seed did so because they had previously had to use exceptionally large quantities of insecticide
为甚麽不是选C.
我的解题思路是：前提一： modified seeds 需要的杀虫剂只是only slightly lower
前提二：modified seeds cost more 并没有产生太多market value
结论： modified seeds不能够economically带来益处
我选择的assumption是: 使用modified seeds的农民种的cotton是否跟使用ordinary seeds的农民种的一样多。
选择的原因是： 只有在种的cotton一样多的情况下，杀虫剂的量和market value的比较才有意义
In general, jobs are harder to get in times of economic recession because many businesses cut back operations.However, any future recessions in Vargonia will probably not reduce the availability of teaching jobs at government-funded schools.This is because Vargonia has just introduced a legal requirement that education in government-funded schools be available, free of charge, to all Vargonian children regardless of the state of the economy, and that current student-teacher ratios not be exceeded.
Which of the following, if true, most strengthens the argument?
The current student-teacher ratio at Vargonia’s government-funded schools is higher than it was during the most recent period of economic recession.
During recent periods when the Vargonian economy has been strong, almost 25 percent of Vargonian children have attended privately funded schools, many of which charge substantial fees.
Nearly 20 percent more teachers are currently employed in Vargonia’s government-funded schools than had been employed in those schools in the period before the last economic recession.
Teachers in Vargonia’s government-funded schools are well paid relative to teachers in most privately funded schools in Vargonia, many of which rely heavily on part-time teachers.
During the last economic recession in Vargonia, the government permanently closed a number of the schools that it had funded.
为什么是B呢？首先要声明， 题目一来我就把ABCDE都否定掉了。呵呵。请高人指点！
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发表于 2010-3-5 10:51:41
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