GWD1-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?
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.
请教NN为什么选D不选A，逻辑是啥？谢谢
这个，我当时也看错了，A是说的BETWEEN WEEDS,你区分杂草有什么用，没达到机器的目的啊
A: considerable degree of variation in shade of color between weeds of different species
that means different species are various in their shade of color; this supporting the topic, so we can conclude the new machine that differentiate kinds of various species by detecting shade of color would be possibile.
E points out, caz certain manipulation, among the same species, they maybe represent unique shade of color. if so, the new machine will select out those belong to same species, that is not what we want. so E weaken topic.
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