一道GWD的逻辑题 求提点

hanshipeng

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.
答案D为啥不能选呢?一开始就有点在C和D 直接疑惑,求解释~谢谢

778879147

D选项明显是一个加强的 C才是一个assumption嘛

hanshipeng

呃...可是如果对鱼的数量造成威胁的还有其他因素这一点不能假定的话,论点也不能成立嘛?.

hjbb1027

lz没看明白d的意思吧，d的意思是   漏油  只能造成 对鱼群数量的损害

hanshipeng

哦 是哦 呵呵 谢咯~

hanshipeng

那选项A呢?

hjbb1027

a把这里讨论的东西都apart from了，讨论其他的是无关的