请教prep1-98 请NN版主lawer解答~

98.   (32682-!-item-!-188;#058&006783)   

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.

答案是C，明白。

但似乎A，D都是排除其他原因的选项，为什么不能选呢？

谢谢~

我不是lawyer拉

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

A  题目中的fear是指pipeline的建造会引起revived pollution.结论是说假设technology effective,那么fears是groundless.即只要installation of the new technology能effective，那么就不会有revived pollution，fears就是groundless.对A取非，即把no去掉，即是Apart from development related to the pipeline, there will be new industrial development around the lake that will create renewed pollution in its waters.讨论pipeline之外的污染源无意义，管它怎样都不会影响结论成立阿

D不管是不是only harm题目是在讨论the development of the pipeline会引起revived harms(即pollution),不在乎harms的构成是怎样阿

希望你满意 ，同时盼望版主lawyer的解答。

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

说漏油造成的唯一harm是对lake's fish population的伤害，反之就是对其它也有伤害，譬如ecological environment. 不是对lake's fish population的伤害只是由漏油造成的。

说漏油造成的唯一harm是对lake's fish population的伤害，反之就是对其它也有伤害，譬如ecological environment. 不是对lake's fish population的伤害只是由漏油造成的。