gwd2-27困惑阿~

Q27:

       先是不知道这个问题提的是什么意思？

       再是不知道为什么选这个？请教阿~~~

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

   Answer

豁然开朗，谢谢。

顶！我也错在A……