【写出题目来源（材料、题号）】

Early in the twentieth century, Lake Konfa became very polluted. Recently fish populations have recovered as release of industrial pollutants has declined and the lake’s waters have become cleaner. Fears are now being voiced that the planned construction of an oil pipeline across the lake’s bottom might revive pollution and cause the fish population to decline again. However, a technology for preventing leaks is being installed. Therefore, provided this technology is effective, those fears are groundless. The argument depends on assuming which of the following?

A. Apart from development related to the pipeline, there will be no new industrial development around the lake that will create renewed pollution in its waters.

B. There is no reason to believe that the leak-preventing technology would be ineffective when installed in the pipeline in Lake Konfa.

C. The bottom of the lake does not contain toxic remnants of earlier pollution that will be stirred into the water by pipeline construction.

D. Damage to the lake’s fish populations would be the only harm that a leak of oil from the pipeline would cause.

E. The species of fish that are present in Lake Konfa now are the same as those that were in the lake before it was affected by pollution.

OA：C

MA：E

【写出自己的答案和OA】

P：

1. 曾经有过污染，鱼少了很多
2. 后来污染改善，鱼数量回升
3. 现在要造 pipeline
4. 安装了防漏新技术（假设技术有效）

C：pipeline 不会造成污染

【写出PS分析，P和C都要写得越简洁越好。不要偷懒skip这一步，PS分析是你迅速看出逻辑链的基础】

W2：pipeline、泄露、污染（跟鱼没有什么关系）

逻辑链：安装了有效的防漏新技术 → pipeline 不会泄露不会泄露 = 不会污染；暗搓搓 shift：泄露 = 污染（除泄露外无其他污染）

【写出W2和逻辑链。注意逻辑链是一环环的箭头推导，不是单纯的P→C】