The mice looked identical to their brothers or sisters but within seconds we knew which ones had the genes and which one didn't." 主语:The mice (老鼠) 系动词:looked (看上去) 表语:identical to their brothers or sisters(和他们鼠兄鼠妹们完全相同) 表示转折关系连词:but (但是) 状语:within seconds (在几秒钟之内) 主语:we 我们 谓语:knew 知道 宾语从句(1)which ones had genes 哪些是带有基因的 宾语从句(2)which one did 哪个是没有的