3. A 20 percent decline in lobster catches in Maine waters since 1980 can be justifiably blamed on legislation passed in 1972 to protect harbor seals. Maine’s population of harbor seals is now double the level existing before protection was initiated, and these seals are known to eat both fish and lobsters.

Which of the following, if true, would most seriously weaken the argument above?

(A) Harbor seals usually eat more fish than lobsters, but the seals are natural predators of both.

(B) Although harbor seals are skillful predators of lobsters, they rarely finish eating their catch.

(C) Harbor seals attract tourists to Maine’s coastal areas, thus revitalizing the local economy.

(D) Authors of the 1972 legislation protecting harbor seals were convinced that an increase in that animal’s numbers would not have a measurably negative impact on the lobster catch.（E）

结论是：1972年开始海豹多了导致1980年后虾少了。问削弱。

A：除了重复原文的内容外，又加了一点无关信息，即吃鱼多。

B：很少吃完虾；无关。反正吃不完估计也死了，归根结底会使虾数量减少。

C：无关。

D：立法者的态度已经不重要了。

E：70年代后期的记录显示很多成年虾（会生育小虾的哦）被捕；他因，说明不一定是海豹把虾干掉啦。