逻辑越做越不会，帮帮我吧，思路一直扭不过来

bunnyfdu2015

A company plans to develop a prototype weeding machine that uses cutting blades with optical sensors and microprocessors that distinguish weeds from crop plants by differences in shade of color.  The inventor of the machine claims that it will reduce labor costs by virtually eliminating the need for manual weeding.

Which of the following is a consideration in favor of the company's implementing its plan to develop the prototype?

	There is a considerable degree of variation in shade of color between weeds of different species.
	The shade of color of some plants tends to change appreciably over the course of their growing season.
	When crops are weeded manually, overall size and leaf shape are taken into account in distinguishing crop plants from weeds.
	Selection and genetic manipulation allow plants of virtually any species to be economically bred to have a distinctive shade of color without altering their other characteristics.
	Farm laborers who are responsible for the manual weeding of crops carry out other agricultural duties at times in the growing season when extensive weeding is not necessary.

选D 题目能看懂，就是搞不清楚选项跟题目到底有没有关系啊

蘑菇开花吧

我也很low 不过我就我的理解说一下吧 说的不对不要打我
就是那个新的机器是根据不同植物阴影不同的颜色来分辨然后再决定要不要wedding的
就是说首先要有阴影颜色的区别那么这个技术才会拥有 而且是要crop plant和weed之间的阴影有区别才能被辨别出来 所以选项里就说首先要有一种技术能在不改变crop的其他性状的基础上让crop的阴影有能不同的（能被独特区分出来的颜色），那么weed和crop才能被很好的区分出来 这个机器才能使用啊 我不知道我说清楚了没。。。。

蘑菇开花吧

这个确实不太好想 但是题目里面提到的就是根据阴影不同区分 那么你就该想到首先得能被区分出来啊然后去找选项

bunnyfdu2015

蘑菇开花吧 发表于 2014-6-26 21:51
这个确实不太好想 但是题目里面提到的就是根据阴影不同区分 那么你就该想到首先得能被区分出来啊然后去找选 ...

谢谢啦，我后来想想，觉得选项有点牵强

brfmzbjz

bunnyfdu2015 发表于 2014-6-26 23:23
谢谢啦，我后来想想，觉得选项有点牵强

如果你一直challenge正确答案
而不是试着去理解它
你永远没法跟上GMAT逻辑的出题思路

D是非常顺理成章的
新的机器通过区分 shade of color 来除weed
要support 那就必须有一个前提 ：weed 和 crop 之间的shade of color 是有区别的

蘑菇开花吧

bunnyfdu2015 发表于 2014-6-26 23:23
谢谢啦，我后来想想，觉得选项有点牵强

额其实不牵强 og里的题每一题都是经典 就是你要get到题目里的点  就是那个东西就是题目所要求的一个前提 而不是乱想出来的 和题目是很贴近的