题目

 The flowers have ___________ to the little room. All things appeared fresh. A. made trouble B. made a difference C. made room D. made way 答案：B已知：三点A（a，1）、B（3，1）、C（6，0），点A在正比例函数y=12x的图象上．（1）求a的值；（2）点P为x轴上一动点．①当△OAP与△CBP周长的和取得最小值时，求点P的坐标；②当∠APB=20°时，求∠OAP+∠PBC的度数．