感謝　　ookkla板友提供　！！^^


1.         GWD-27-Q35

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.

A