请教：

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?

1. There is a considerable degree of variation in shade of color between weeds of different species.

2. The shade of color of some plants tends to change appreciably over the course of their growing season.

3. When crops are weeded manually, overall size and leaf shape are taken into account in distinguishing crop plants from weeds.

4. 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.

5. 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.
   

拜托，哪位NN指导一下，对这道题完全没有思路，呜呜。

我记得这道题之前有讨论过.你可以翻番之前的讨论贴. 我在GWD的资料里只查到比较简短的说明.然后自己写了一 些补充.希望有帮助.

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?

1. There is a considerable degree of variation in shade of color between weeds of different species.无关

2. The shade of color of some plants tends to change appreciably over the course of their growing season.

3. When crops are weeded manually, overall size and leaf shape are taken into account in distinguishing crop plants from weeds.

4. 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.

改变颜色的同时不会改变植物其它特性

5. 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.

 前提: 一个公司研发了一种光感除草机,这种机器能根据各种植物不同的色度来分辨草的种类,良或者劣.

 结论:公司声称自己的机器可以减少因分辨杂草所多花的劳动成本.

 问题:对公司的发展计划有利的论述.

 A.只提出不同杂草的颜色不同.没有提及所有的草的种类的分别. 以偏盖全.

 B. 一些植物的颜色会随着生长变化. 以偏概全.

 C.手动除草的优势.要根据草的大小,形状和颜色综合分辨, weaken论述.

 D. 有条件的培育出植物可以只用色差就可以分辨,而不用改变其他特性. 支持论述用除草机好.

 E. 劳动力可以同时做其他事情.无关选项.

1. 在草的各种种类中颜色有很大的不同，对不起，文章比较的是庄稼和草的颜色，所以是无关选项。
2. 庄稼的颜色在生长季节可能发生很大的变化，对不起，没有比较庄稼和草，所以还是无关选项。
3. 当庄稼手工除草时，大小和叶子形状也在区分庄稼和野草时加以考虑，这个也是无关选项，文章只比较颜色。
4. .基因选择和操控可以使得庄稼可以最终经济的有一个与众不同的颜色而且也不改变他的其他特性，当然和野草也就很方便的分辨出来罗，所以是加强。

5. .老公在除草是还有其他任务，无关。