向大牛请教一题目

wuqian321

In polluted environments, dolphins gradually accumulated toxins in their body fat, and the larger the dolphin, the more accumulated toxin it can tolerate.  Nearly 80 percent of the toxins a female dolphin has accumulated pass into the fat-rich milk her nursing calf ingests.  Therefore, the unusually high mortality rate among dolphin calves in the industrially contaminated waters along Florida’s Gulf Coast is probably the result of their being poisoned by their mother’s milk.



Which of the following, if true, most strengthens the argument?



A.      The survival rate of firstborn dolphin calves in the area along Florida’s Gulf
                       Coast is highest for those whose mothers were killed before they were weaned.



B.      The rate at which adult dolphins living in the waters along Florida’s Gulf
                       Coast accumulate toxins is no higher than that of adult dolphins in comparably polluted waters elsewhere.



C.      Among dolphin calves born in the area along Florida’s Gulf
                       Coast, the mortality rate is highest among those with living siblings.



D.      As dolphins age, they accumulate toxins from the environment more slowly than when they were young.



E.       Dolphins, like other marine mammals, have a higher proportion of body fat than do most land mammals.


B错误的原因是因为无关比较吗？这类题有关无关如何判断呀？

九段泡面高手

B错的问题是 题干没有提供拿来做对比的那些生活在污染水域的海豚的小孩的死亡率，即使证明了两者积累的毒素一样多也无法说明任何问题??

正确答案是A么？我觉得C也可以，你喝奶多，你挂了，你兄弟姐妹没奶喝，他们活了??不过综合考虑我还是会蒙A??
楼主一定记得恢复我正确答案哈^0^

gonghao

B的 adult dolphins 和文章没啥关系