52.Rye sown in the fall and plowed into the soil in early spring leaves a residue that is highly effective at controlling broad-leaved weeds, but unfortunately for only about forty-five days. No major agricultural crop matures from seed in as little as forty-fi ve days. Synthetic herbicides, on the other hand, although not any longer-lasting, can be reapplied as the crop grows. Clearly, therefore, for major agricultural crops, plowing rye into the soil can play no part in effective weed control.
The argument is most vulnerable to the objection that it fails to
(A) consider that there might be minor, quick-growing crops that do mature in forty-fi ve days or less
(B) identify any alternative method of weed control that could be used instead of the method it rejects
(C) distinguish among the various kinds of synthetic herbicides
(D) allow for the possibility of combining the two weed-control methods it mentions
(E) allow for the possibility that plants other than rye, handled the same way, might have the same effect
这题没做对，主要是题设让我有一点摸不着头脑，不太理解什么意思。说RYE这个东西可以control weed，但是只能持续45天。。但是这个和“No major agricultural crop matures from seed in as little as forty-five days.”有什么关系吗？？？RYE这个东西不能在agricultural crop 成熟了以后再用吗？``请好心人帮帮忙··作者: jianglxiang 时间: 2010-5-31 06:39
