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Q21:TT-GWD 2-27

Rye黑麦 sown播种 in the fall and plowed犁耕
            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

A.
consider that there might be minor, quick-growing crops
that do mature in 45 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D,我选了B

把题目看懂后,知道B是无关选项,也看懂了ABCE是无关.不过还是不明白为什么D正确?请NN指点.

如果在实战中碰到这题,肯定死翘翘了,有什么办法能猜对吗?

这道题按WEAKEN来处理结论是plowing rye对weed control没有任何作用注意表述方式：play no part

D选项说将两个方法放在一起用可能证明其是play part in effective weed control（只是可能）

我只提出一种可能性：80% Synthetic herbicide和20%splowing rye 所取得的效果远不如20%Synthetic herbicide 80% splowing rye 说明splowing rye 在weed control里起到的效果（多少效果不用管）

注意这里是有用那么有多大的作用？谁更有用？这个不用管美国人的思维就是这样不需要充分性 “有这个可能性”就行了。