鱼儿不停地用口吞水,再从鳃孔把水排出,其意义是( )
A:排泄体内含氮的废物
B:完成呼吸和摄食
C:散发体内的热量
D:交换体内的水分
下列对细胞有关知识的叙述错误的是( )
His failure made his father think him a ___________ boy.