[問題]GWD2-Q27

[fsab00037748]

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

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

答案給D

請問解題思路為何?

[hwatai]

A.錯,,因為題目討論的是major agricultural crop
B.錯,,題目討論的是rye與herbicide,,,其它alternative偏離討論
C.錯,,無關選項,就算distingusih出來了,,也沒有立場打壓rye的功效
E.錯,,同B,,alternative偏離討論

D.有點勉強...兩者同時採用,也許會更有加倍效果→所以rye還是有用的，
只能算是比另外四個選項好的答案

[fsab00037748]

嗯嗯 謝謝hwatai, 我後來自己再想想後.有了以下理解:

這題結論說 "for major agricultural crops, plowing rye into the soil can play no part in effective weed control. " 說這個plowing rye一點用都沒有

而題目說"The argument is most vulnerable to the objection that it fails to " (等於要weaken此題的結論)

所以答案D, two weed-control methods it mentions 指出rye或許也是有一點效用的, 於是weaken了題目認為它一點都無用說法

[Penny Lee]

我不太懂以下這句話的意思,麻煩一下
Synthetic herbicides, on the other hand, although not any longer-lasting, can be reapplied as the crop grows.
是說有試過用綜合除草劑,但是都撐不久,rye還是很快就掛了???

D說的two weed-control methods是指哪兩種方法呢???

[Penny Lee]

我在重新看過之後明白了,是我把題目的方向弄錯了

邏輯果然也是重在閱讀