图甲是某家族单双眼皮的遗传情况（显性基因用A表示，隐性基因用a表示），图乙是人的生殖过程中一个受精卵分裂后偶然发育为两个胚胎，两个胚胎发育成两个孩子的部分阶段．请据图回答：
组成一个生态系统，必须具备下列哪些成分？（ ）
what ,be ,an ,last, some ,the, in ,your ,black ,my ,call, how
Hello, everyone. I ____ Frank Smith.Frank is my first name.My ____name is Smith.This is my schoolbag.It's ____. In it,you can see ____books and a pencil box. ____ is that? Oh,it is a watch. And ____ watch is yellow. It isn't____ . I found it ____ Class 7A. Is it ____? Please ____ Frank at 9556833.
