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题库 / GMATLA-CR-83
Plant scientists have been able to genetically engineer vegetable seeds to produce crops that are highly resistant to insect damage. Although these seeds currently cost more than conventional seeds, their cost is likely to decline. Moreover, farmers planting them can use far less pesticide, and most consumers prefer vegetables grown with less pesticide, therefore, for crops for which these seeds can be developed, their use is likely to become the norm.
which of the following would be most useful to know in evaluating the argument above?
Whether plant scientists have developed insect-resistant seeds for every crop that is currently grown commercially
Whether farmers typically use agricultural pesticides in larger amounts than is necessary to prevent crop damage.
Whether plants grown from the new genetically engineered seeds can be kept completely free of insect damage.
Whether seeds genetically engineered to produce insect-resistant crops generate significantly lower per acre crop yields than do currently used seeds.
Whether most varieties of crops currently grown commercially have greater natural resistance to insect damage than did similar varieties in the past.
逻辑链：尽管转基因种子比传统种子贵，他们的成本可能会下降。并且，种转基因种子的农民用更少的农药，更受顾客欢迎。因此转基因种子的使用很快就会流行起来。问evaluate
choice b, 是否农民在打农药的时候用的量比预防虫害的量要大。Irrelevant，即使这个选项回答是对的，就说明是因为农民自身习惯使得转基因种子的一个优点“虚高”了，但不影响-“农药减少，会受顾客喜欢”的预测
choice c, 是否转基因种子种植出来的植物能够完全不受到虫害影响。irrelevant，
choice d,是否转基因种子种出来的防虫作物的每亩产量比现在用的种子种出来的亩产量低。correct，指出了转基因种子的一个缺陷，如果亩产量差得相当远，那么即使有两个优点也没办法掩盖缺陷
将评价题看作是削弱题来思考
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