GWD，呼朋唤友，CDer们都来看看嘛

小混球

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?

A.Whether plant scientists have developed insect-resistant seeds for every crop that is currently grown commercially
B.    Whether farmers typically use agricultural pesticides in larger amounts than is necessary to prevent crop damage.
C.    Whether plants grown from the new genetically engineered seeds can be kept completely free of insect damage.
D.    Whether seeds genetically engineered to produce insect-resistant crops generate significantly lower per acre crop yields than do currently used seeds.
E.    Whether most varieties of crops currently grown commercially have greater natural resistance to insect damage than did similar varieties in the past.
正选是D，就是产量比较。但是我想不通B,回答“是”，则农民现在可以减少农药的使用量-成本降低-消费者更喜欢购买；回答“否”，农民原来的用药合适，新措施可以达到目标。
大家赶紧救救我吧，越想越觉得对。

12604698

b，回答是，农民减少农药使用--成本降低。attention，这里没说能降低到比新药还低。如果降低了还不足以和新药抗衡，消费者更爱买另一个了~

泾渭不凡

b，回答是，农民减少农药使用--成本降低。attention，这里没说能降低到比新药还低。如果降低了还不足以和新药抗衡，消费者更爱买另一个了~

-- by 会员 12604698 (2011/12/18 16:28:29)