在平面直角坐标系内，点O为坐标原点，A（﹣4，0），B（0，3）．若在该坐标平面内有以点P（不与点A、B、O重合）为一个顶点的直角三角形与Rt△ABO全等，且这个以点P为顶点的直角三角形与Rt△ABO有一条公共边，则所有符合条件的三角形个数为（　　）

— Who am I?

— ______ Mary.   

公元前260年，秦大破东方六国中实力最强的赵国军队,坑杀赵军士卒40多万人，从此，六国再也无力抵御秦国攻势。这场战争是  （　）

    Hello! My name is Amy. I am eleven years old. I like yellow. That's my favourite colour. I like to draw pictures, and that's my favourite school work. My favourite food is hamburgers. I like hamburgers for lunch. I like my Chinese teacher, so my favourite subject is Chinese. I like my yellow dress very much.

标志着植物体进入营养器官生长阶段的是 (    )