①Is there a map on the wall?____        A.She is a worker.

②What 's your mother 's job? ____       B.You're welcome.

③Thank you. ____                       C.14.

④How many boys are there ? ____       D.She's fine.

⑤How is your mother? ____             E.Yes,there is.

某地分布着A、B、C等多个小水潭，A、B中都有孔雀鱼，C中无孔雀鱼．A中孔雀鱼的天敌是花鳉，专以幼小孔雀鱼为食； B中孔雀鱼的天敌是狗鱼，专以体形大而成熟的孔雀鱼为食．调查发现，B中的孔雀鱼通常比A中的孔雀鱼成熟早，且成熟时体重较轻．请回答问题：