題目結論:their mother’s poisoned milk-->high mortality rate among dolphin calves 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. ()內文字為選項內文
A , Strengthen: no poisoned milk (their mothers were killed before they were weaned)--> no high mortality rate among dolphin calves (survival rate is the highest) | 
