求助:大全逻辑题

typhoon_wang · 发表于 2010-5-20 06:01:55

12.Which of the following best completes the passage below?不懂
Monarch butterflies, whose average life span is nine months, migrate from the midwestern United States to selected forests outside Mexico City
. It takes at least three generations of monarchs to make the journey, so the great-great-grandchildren who finally arrive in the Mexican forests have never been there before. Yet they return to the same trees their forebears left. Scientists theorize that monarchs, like homing pigeons, map their routes according to the earth’s electromagnetic fields. As a first step in testing this theory, lepidopterists plan to install a low-voltage transmitter inside one grove of “butterfly trees” in the Mexican forests. If the butterflies are either especially attracted to the grove with the transmitter or especially repelled by it, lepidopterists will have evidence that______(A) monarch butterflies have brains, however minuscule 杀
(B) monarch butterflies are sensitive to electricity关键词是low
(C) low-voltage electricity can affect butterflies, whether positively or adversely 杀
(D) monarchs 范围错，文中指的是（monarch butterflies）map their routes according to the earth’s electromagnetic fields（B）
(E) monarchs communicate in intergenerationally via electromagnetic fields 杀

高手们帮我解释下,我的解释对吗?
你们上怎么解释这题的呢? 我觉得排除D好牵强呀

bonnie0715 · 发表于 2010-5-21 18:53:25

一般一个从试验的结果所得出的结论必须是直接的,丝毫不含任何其他信息的。如果之间存在了不同于试验的信息，叫假设。虽然说我们学过电流会产生磁场，但这明显是课外知识且本题中丝毫不存在任何有关的信息。因此，试验室电就是点，D中出现了背景中的电磁场，这是错误的。楼主你对排除D的思路也是可靠地

求助:大全逻辑题

所属分类: GMAT考试

正在浏览此版块的会员 ()