OG CR49. Certain genetically modi?ed strains of maize produce a powerful natural insecticide. The insecticide occurs throughout the plant, including its pollen. Maize pollen is dispersed by the wind and frequently blows onto milkweed plants that grow near maize ?elds. Caterpillars of monarch butter?ies feed exclusively on milkweed leaves. When these caterpillars are fed milkweed leaves dusted with pollen from modi?ed maize plants, they die. Therefore,
by using genetically modi?ed maize, farmers put monarch butter?ies at risk.
Which of the following would it be most useful to determine in order to evaluate the argument?
再帖一个OG的CR题,GMAC自己用的by using。。。
-- by 会员 幸运四叶草 (2011/10/26 22:57:38)
找到了一道类似题:
PREP 2旧 23. [OG原题,OG10-264]
Scientists believe that unlike the males of most species of moth, the male whistling moths of
Nambung, Australia, call female moths to them
by the use of acoustical signals, but not olfactoryones, and they attract their mates during the day, rather than at night.
(A) by the use of acoustical signals, but not olfactory ones, and they attract
(B) by the use of acoustical signals instead of using olfactory ones, and attracting
(C) by using acoustical signals, not using olfactory ones, and by attracting
(D) using acoustical signals, rather than olfactory ones, and attract
(E) using acoustical signals, but not olfactory ones, and attracting
答案是D,同样排除了by using这个用法(尽管通过句意也可以排除)
但是是否说明by 和use的用法重复呢?
期待NN讨论~
-- by 会员 幸运四叶草 (2011/10/22 0:25:54)