Q19
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 pes-
ticide, 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 to 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. 太绝对
D. Whether seeds genetically engineered to produce insect-resistant
crops generate significantly lower per acre crop yields than do
currently used seeds. ，没比较
E. Whether most varieties of crops currently grown commercially have
greater natural resistance to insect damage than did similar vari-
eties in the past.范围不对
答案给的是D,我不明白B为什么不对，谢谢
D给比较了，比较genetically engineered 和 普通的seeds
肯定回答，对conclusion是support 否定回答，对conclusion是weaken
B，用pesticide的多少，与题目没什么关系吧，genetically是因为不用农药，所以好，而普通植物用农药，无论多少，都是不好
所以，肯定与否定，对conclusion都没有作用……
谢谢你的回答。原文给的比较是成本的高低，D跟给的是产量的多少。而且原文也说了pesticide用的少了很多，消费者乐意买含有少量pesticide的crops.怎么解释？
来提点个人想法，原文的结论其实是Therefore, for crops for which these seeds can be developed, their use is likely to become to norm.
之前成本和杀虫剂都是推出这个结论所用的理由
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