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标题: 求助GWD1-33 [打印本页]

作者: wendyweng 时间: 2008-7-21 18:58
标题: 求助GWD1-33

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.

作者: jh1904 时间: 2008-7-21 23:37
The answer should be D. The weeding machine relies on the differences in shade of color to function properly. Choice D supports the idea by saying that the shade of color of crop plants can be controlled through selection and genetic manipulation.

A. makes it more difficult for the weeding machine to function properly.

B. also makes it more difficult for the weeding machine to function properly.

C. As the weeding machine relies solely the differences in shade of color, this indicates that manual weeding is more sophisticated and could be a challenge for the machine to function properly.

E. Irrelevant.

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