大全test18-3

fengchen318

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(海港,避难所) 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 （食肉动物）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（使复兴） 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）
(E) The record lobster harvests of the late 1970’s removed large numbers of mature lobsters from the reproductive stock.
请帮忙解释一下E说的是啥啊。。。

Kb24

1970年的龙虾捕获大丰收，导致大量的准备生小龙虾的老龙虾们被搞死了。。。因此70年代以后的龙虾捕获量大大减少啦 -- 因此SEAL不是罪魁祸首 - 他因削弱