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?
A.There is a considerable degree of variation in shade of color between weeds of different species.
B.The shade of color of some plants tends to change appreciably over the course of their growing season.
C.When crops are weeded manually, overall size and leaf shape are taken into account in distinguishing crop plants from weeds.
D.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.
C是说当人工作业的时候，overall size和leaf shape都被考虑进去，跟this plan无关；E是说有了机器以后原来负责weeding的这些人可以去干别的duties了，这也跟in favor of this plan无关啊；而D就是支持这个plan了，说只用shade of color而不用其他特征就能适用于所有的plant并economically bred；A和B都只说plant or weed，忽略了二者关系所能导致的implementing plan~~
我是这么理解的~不知道对不对···作者: Gracespa 时间: 2012-9-29 06:16
CE与原文所说的implement machine to reduce labor cost 无关
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