标题: 求解释一道 OG 上CR题 [打印本页] 作者: jyz2390 时间: 2012-7-8 17:36 标题: 求解释一道 OG 上CR题 Extinction is a process that can depend on a variety of ecological, geographical, and physiological variable. These variable affect different species of organisms in different ways, and should, therefore,yield a random pattern of extinctions. However, the fossil record shows that extinction occurs in a surprisingly definite pattern, with many species vanishing at the same time.
Which of the following, if true, forms the best basis for at least a partial explanation of the patterned extinctions revealed by the fossil record.
A. Major episodes of extinction can result from widespread environment disturbances that affect numerous different species. B. Certain extinction episodes selectively affect organism with particular sets of characteristics unique to their species. C. Some species become extinct because of accumulated gradual changes in their local environment. D. In geologically recent times, for which there is no fossil record, human intervention has changed the pattern of extinction. E. Species that are widely dispersed are the least likely to become extinct.
the answer is A.作者: sheryter 时间: 2012-7-9 16:33
传统规则：不同的环境，生态环境 -> 不同的死法 具体事例（the fossil record，注意the,指某一个化石)： 石化反映出一样死法
求解释。
那解释就是species遭遇了相同的环境。 关键要表达出所有物种遭遇了一致性的环境因素。
看答案： A. 环境巨变影响了多种物种 -> 正确 B. 选择性影响物种中有特殊属性的个体 -> likely to weaken C. 逐渐变换导致绝种 -> at the same time矛盾，也和一致的环境无关 D. 和fossil无关了 E. 种类易于灭绝的程度，无关作者: jyz2390 时间: 2012-7-9 22:57
谢谢，题干中的“however" 迷惑了我，让我觉得前后是转折关系。