扫描二维码，直接登录
题库 / Prep2012-CR-34
In polluted environments, dolphins gradually accumulate toxins in their body fat, and the larger the dolphin the more accumulated toxins 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?
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.
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.
Among dolphin calves born in the area along Florida's Gulf Coast, the mortality rate is highest among those with living siblings.
As dolphins age, they accumulate toxins from the environment more slowly than when they were young.
Dolphins, other marine mammals, have a higher proportion of body fat than do most land mammals.
A 在Florida新出生的海豚存活最高的情况是母亲在他们断奶前就被杀了
B 成年海豚身体的毒素在Florida的和其他地方的没差，这个不是support
C：已知
D：讲到了环境对毒素的影响，与母乳传递的无关
E: body fat与母乳传递无关！
登录 或 注册 后可以参加讨论