[求助] TTGWD 2-27

Q27:

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 45 days.  No major agricultural crop matures from seed in as little as 45 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

1. consider that there might be minor, quick-growing crops that do mature in 45 days or less
2. identify any alternative method of weed control that could be used instead of the method it rejects
3. distinguish among the various kinds of synthetic herbicides
4. allow for the possibility of combining the two weed-control methods it mentions
5. allow for the possibility that plants other than rye, handled the same way, might have the same effect    (D)

没有搜到以往的讨论。 做题的时候是用排除法选了D,因为其他选项明显有误，可是D仔细想想好像也显得突兀。还是没明白其中的reasoning. NN们帮忙啊～

题目整体感觉很不好，特别是on the other hand来的，如楼主所说，很突兀.

从推理上看，题目说在土里面种什么东西就可以除草，但由于只再45天有效，而农作物的成熟期远长于这个时间。另外，用合成除草剂虽然也没有更长，但可以反复用。然后得出结论种rye对有效的除草没用。

可能在结论之前加一句，与合成的除草剂比较，会比较通顺，不知道是题目少写了还是什么。

问那方面容易被攻击，提干中两个都不完善，但可以结合起来用。这样一定最有效。所以选D，我感觉这种题型有特殊性，只能从选项里找答案（排除法），比较难预测，因为提干的逻辑不完整。

题目的结论是plowing rye into the soil can play no part in effective weed control

也就是说rye完全没有用！D选项正是攻击的这一点。