参考答案

正确答案：B
解析：根据材料中“However, relative to the rest of the body, a sperm whale's brain is only about 0.02 percent of its body weight, while a human brain is about 2 percent. (然而，相对于身体而言，抹香鲸的大脑占据身体总重量的0.02%，而人类大脑占2%。)”同时，又根据“The sperm whale's brain is…six times the size of a human brain. (抹香鲸的大脑是人脑的六倍。)”这样如果抹香鲸重30吨，其大脑=30xO.02%=0.15(吨)，等于人脑的六倍，所以人脑重量=0.15÷6=0.025(吨)，人的身体=人脑重量÷2%=0.025÷2%=0.0125(吨)=125(公斤)。B项正确。