GWD-1-33

觉得应该选A,但答案是D，

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Q33:

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.

问的问题是：哪种情况有利于该公司实行开发除草机的计划

A显然是一种不利的情况，因为文中说除草机是基于区别野草和庄稼的shade of colors而工作的，而A说：不同种类野草的shade of colors相当不一样，这样自然就对除草机基于shade of colors辨别野草增加了困难。——反之，考虑一种极端情况，如果所有野草都是同一种shade of colors，那么除草机就很容易辨别野草和庄稼了。

D说：通过选种和基因控制，能够让各种庄稼在不改变其他特性的情况下都有一种独特的shade of color，这样自然有利于除草机根据shade of colors的辨别来除草了。

工人可以做其他农活，并不是成本降低了吧

我选了C, 我是这样理解的: 当人工锄草的时候, 叶子的形状和大小也是要考虑的因素, 新剪草机的工作原理如果能在考虑shade of colors的同时也考虑叶子的形状和大小因素, 那么这个新产品的功能将进一步增强, 所以考虑C选项也能有助于生产厂商设计产品的广泛的实用性......

人家是靠杂草和庄稼间的差别来工作的，杂草自己颜色不一样有什么用。所以A不对。

但是如果可以控制庄稼的颜色，那就能够让一些颜色像杂草的庄稼变成不像了。当然就能区别咯。所以D对。

E一点关系都没有。

我把那个weeding当作播种机了，看来看去就只好选A。唉，太土。