求助 OG12-52

bdsjb116 · 发表于 2010-8-31 15:57:09

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-fi ve 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, quickgrowing
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

答案是D
本人系菜鸟刚开始做OG 这题刚开始看时候就觉得头疼，第一次选的E 第二次选的A 无奈都错了
可否请各位大牛指点迷津提供点做题思路谢谢~

bdsjb116 · 发表于 2010-8-31 16:26:52

顶一下

Oderic · 发表于 2010-8-31 17:40:01

这相当于削弱题
Evidence:1.Rye控制weeds有效期为45天
2.major crop45天无法成熟
3.除草剂虽然不能长久使用，但可以反复使用
Conclusion: Rye 对于major crop没有任何控制杂草作用
其实是evedence1&2推出了conclusion
A.提到minor crop，与之前推理无关，错
B.无关，有没有其他控制杂草方法都不影响我Rye到底有没有用
C.除草剂，无关，不管除草剂什么种类都毫不影响 evidence1&2推出conclusion
D.如果两种除草方法混用是effective的，那么Rye就有用，影响到了结论，正确
E.无关，用Rye以外的植物来除草，就算很有效，与我结论何干？

正确认识无关项很重要

bdsjb116 · 发表于 2010-8-31 18:40:08

感谢ls 好人一生平安

求助 OG12-52

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