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标题: GWD 1-33? [打印本页]

作者: huaye221 时间: 2007-8-6 10:25
标题: GWD 1-33?

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?

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

答案是D，问为何E不对？用该机器主要原因就是节约劳动成本，E不正说明了这一点吗？谢谢！！

[此贴子已经被作者于2007-8-6 10:27:10编辑过]

作者: Drakedirect 时间: 2007-8-6 11:21
E是个无关选项，劳动者是不是还有其他职责对本题起不了任何作用。

作者: huaye221 时间: 2007-8-7 12:51
多谢drakedirect解答疑问．如变成"ｃａｎ" carry out 是否对些呢？

作者: Drakedirect 时间: 2007-8-7 12:59
我认为也不对，文中讨论的问题是manual weeding of crop，其他责任都是out of the scope.

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