题目

The world's population has grown six timesit was in 1800. A . by; what B . by; that C . in; what D . to; that 答案：A以下属于先天性行为的是（ ）。①被蜜蜂蜇过的猴子不再取食蜂蜜②失去雏鸟的美国红雀，捕食昆虫饲喂浮到水面张口求食的金鱼 ③母鸡孵小鸡 ④老鼠走迷宫而取到食物 ⑤蚯蚓避开电刺激而爬向潮湿的暗室A．①④ B．②③ C．④⑤ D．①⑤