以下是引用zx_nju在2005-10-21 14:43:00的发言: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?
- 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.
错选(C) 该选(D) my thread:A, between weeds of different species.原文基于weeds from crop plants.不同的范围.B, shade of color change,不利, C和E怎么排除
突然觉得CR好容易( 有很多吹牛陈份啦。。。)
虽然ProteinMonica已经有讨论此题,但偶还是想说两句。
1)C怎么排除:(抓住重点于脑中:有利于该公司实行开发除草机的计划)So,all we care about is: a prototype weeding machine. All we want is machine-related. So who cares about: When crops are weeded manually,...? (不要去管人工除草啦!不care!)
2)E怎么排除:(错在结论的范围被扩大)我要的是除草机,扯到other agricultural duties,显然无关!( 不要受原文目的在reduce labor costs 的骗!)
结论的时间范围也不对:割草时(我要除草机) Vs. 不割草时(不割草时,Farm laborers干什么,现在who cares?)
3)正确答案理解:D(加强结论是通过给个正面的证据):通过...(一些方法)...让各种庄稼在不改变其他特性的情况下都有那种shade of color,这样自然有利于除草机根据shade of color来辨别除草喽。
zx_nju ,不知以上分析有没回答你对此题的疑问?加油!努力!搞明白! |