题目

已知角终边上一点的坐标为，则角是 A. B. C. D. 答案：【答案】D【解析】利用任意角的三角函数的定义，诱导公式，求得角的值．角终边上一点的坐标为，，，即 ，，则角是，故选：D．The water companies were instructed to keep the people ______ to the polluted water.A．from exposingB．being exposedC．exposingD．from being exposed