题目

—It is reported that many wild animals in the world are ________ because of human behavior. —We must do something to stop people from hunting and selling these animals. A．in danger  B．in public  C．in silence 答案：A20．若直角三角形的两边长为a、b，且$\sqrt{{a}^{2}-12a+36}$+|b-8|=0，则该直角三角形的斜边长为8或10．