单选题 A ______ biologist studies the fish and other living things in the oceans.
A. merry B. typical
C. professional D. marine

【正确答案】 D
【答案解析】[解析] 形容词辨析
A.merry欢乐的,愉快的;B.typical典型的;C.professional专业的,职业的;D.marine 海的,海产的;因此D为答案。