【求助】OG Verbal分册CR51

shixi0304

51. Acompany 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 laborcosts 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?
(A) There is a considerable degree of variation in shade of color between weeds of different species.
(8) The shade of color of some plants tends to change appreciably over the course of their growing season.
(e) When crops are weeded manually, overall size and leaf shape are taken into account in distinguishing crop
plants from weeds.
(0) 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.
(E) 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.

为什么选D？ A又为什么不对呢？
求牛牛解答一下~~~~~

perain

(A) There is a considerable degree of variation in shade of color between weeds of different species.

这个选项的意思是说weed的各种种类之间就有很多不一样的shade of color，这样会影响机器的判断，是weaken。weeds of different species这个地方容易读错

Away90

背景：A 打算发明一种用optical...和microprocessors...区别杂草和作物的shade of color的方法的PW机器（去杂草的）

A声称这个机器可以减少人工劳动

问题：需要考虑什么因素来促进这个plan。
推理过程：
1 问题中的in favor of 有加强的含义
2 这个计划之所以可以实施，依靠的是区别颜色，D正好用“distinctive shade of color”来保证了这一点，可是A的意思（a considerable degree of...color）正好不利于这个机器来区别,削弱了这个手段。

LZ,我的理解仅仅从意思层面，你可以去看看牛牛们解题思路。