PREP 64

adpang

64. Whereas the use of synthetic fertilizers has greatly expanded agricultural productivity in many parts of the world, an increase in their use can create serious environmental problems such as water pollution, and their substitution for more traditional fertilizers may accelerate soil structure deterioration and soil erosion.
A. an increase in their use can create serious environmental problems such as water pollution, and their substitution for more traditional fertilizers
B. an increase in their use can create serious environmental problems like water pollution, and if substituted for more traditional fertilizers, it
C. if these fertilizers are used increasingly, they can create serious environmental problems such as water pollution, and if used as substitutions for more traditional fertilizers, they
D. the increased usage of these fertilizers can create serious environmental problems such as water pollution, while if substituted for more traditional fertilizers, this substitution
E. the increased usage of these fertilizers can create serious environmental problems like water pollution, while their substitution for more traditional fertilizers

 答案A，中的ｔｈｅｉｒ没有修饰问题吗？并且应该是the usage导致严重的环境问题啊。如果是increase应该的导致的环境问题的增长啊

又抓狂了

xizzhu

their 指的是 synthetic fertilizers

the use of synthetic fertilizers = their use

64. Whereas the use of synthetic fertilizers has greatly expanded agricultural productivity in many parts of the world, an increase in their use can create serious environmental problems such as water pollution, and their substitution for more traditional fertilizers may accelerate soil structure deterioration and soil erosion.

[此贴子已经被作者于2006-12-10 14:24:28编辑过]

adpang

不存在ｔｈｅｉｒ指代ｐａｒｔｓ的可能吗？

qiuzhen28

代词的问题很困惑
而且我个人做了GMAT-PREP前面的90道题目
非常多的选项是在添加 they 上面做文章
有没有NN能够概括一下这么多的they的用法啊

py5223

1) A's use of "their" could be seen as ambiguous (fertilizer of parts of the world?)
2) D compares "use" to "usage" while A compares "use" to "increase"

A is better than D. D has problem : whereas - while : redudant



Any one can explain the "their"?

fdrandom

the use of...，their use...有这层关系，可以指代吧