求助：大全-20-2

j96111

Mud from a lake on an uninhabited wooded island in northern Lake Superior contains toxic chemicals, including toxaphene, a banned pesticide for cotton that previously was manufactured and used, not in nearby regions of Canada or the northern United States, but in the southern United States. No dumping has occurred on the island. The island lake is sufficiently elevated that water from Lake Superior does not reach it.

The statements above, if true, most strongly support which of the following hypotheses?

(A) The waters of the island lake are more severely polluted than those of Lake Superior.

(B) The toxaphene was carried to the island in the atmosphere by winds.

(C) Banning chemicals such as toxaphene does not aid the natural environment.

(D) Toxaphene has adverse effects on human beings but not on other organisms.（B）

(E) Concentrations of toxaphene in the soil of cotton-growing regions are not sufficient of be measurable.

看了以前的解释，但觉得不详细，还是不明白，求助于各位NN.

alsokkk

首先声明俺不是NN。说说我的理解，不知道对否。

话说在北方的大湖（LakeSuperior)中间有个无人居住生长着树林的小岛。这个小岛上也有个湖（姑且称作小湖），小湖的泥里含有一种有毒的化学物质（toxaphene),该物质是被禁用的用于棉花的杀虫剂，这种棉花以前产自美国南方，而不是加拿大地区和美国北方。而这个小岛未发生过垃圾倾倒事件，而且这个小岛的湖很高，大湖里的水是无法进入的。问下列哪项假设支持这个现象：

A废话。重复题目的事实。

B提供另一种小湖里为何出现toxaphene的原因，听起来合理，因此支持。

C超出题目讨论的范围。

Dtoxaphene的副作用与题目无关

Etoxaphene的浓度测量也与题目无关