大家看两道难题，探讨一下

yilin2288

40. GWD-23-Q14
                

Plantings of cotton bioengineered to produce its own insecticide against bollworms, a major cause of crop failure, sustained little bollworm damage until this year.  This year the plantings are being seriously damaged by bollworms.  Bollworms, however, are not necessarily developing resistance to the cotton’s insecticide.  Bollworms breed on corn, and last year more corn than usual was planted throughout cotton-growing regions.  So it is likely that the cotton is simply being overwhelmed by corn-bred bollworms.

In evaluating the argument, which of the following would be most useful to establish?

1. Whether corn could be bioengineered to produce the insecticide

2. Whether plantings of cotton that does not produce the insecticide are suffering unusually extensive damage from bollworms this year

3. Whether other crops that have been bioengineered to produce their own insecticide successfully resist the pests against which the insecticide was to protect them

4. Whether plantings of bioengineered cotton are frequently damaged by insect pests other than bollworms

5. Whether there are insecticides that can be used against bollworms that have developed resistance to the insecticide produced by the bioengineered cotton

答案是B，但是我想不明白，我总觉得选C

31. GWD25-Q31

New items developed for automobiles in the 1997 model year included

a safer air bag , which, unlike previous air bags, eliminated the possibility

that a burst of smoke would appear when the bag inflated, and making an

already terrified passenger think the car was on fire.

A.     inflated, and making.

B.     Inflated, so that it could make.

C.     Inflated and made.

D.     Inflated and make.

E.      Inflated to make.

这个题答案选的是E，我觉得应该选D，大家说呢

还有一道数学

1.          45本书，其中要么是英文的，要么是西班牙文的；要么是平装的，要么是简装的。现在从中随机取出一本书，问抽出的是平装西班牙文书的概率是否大于1/2？
                    

         （1）有30本平装书
                    

         （2）有15本西班牙文书    B

不明白为什么选B，请高手指点

carolhide

晕，LZ可否在每个版面里讨论相应的题目，逻辑题去逻辑区，数学题在数学区发贴。感谢配合。

各个区的发贴规范：

GMAT机经＋MATH讨论
http://forum.chasedream.com/dispbbs.asp?boardID=22&ID=128922

GMAT语法区版规
http://forum.chasedream.com/dispbbs.asp?boardID=23&ID=79830

GMAT逻辑区格式和搜索
http://forum.chasedream.com/dispbbs.asp?boardID=24&ID=74827

GMAT阅读区-发贴格式和搜索提示
http://forum.chasedream.com/dispbbs.asp?boardID=25&ID=41017

GMAT AWA区版规
http://forum.chasedream.com/dispbbs.asp?boardID=26&ID=107312

方便自己，方便他人，感谢您的理解和支持！