题目

直线的倾斜角为（ ）A. -30° B. 60° C. 120° D. 150° 答案：【答案】D【解析】先根据直线方程求斜率，再求倾斜角.因为，所以斜率为，倾斜角为150°,选D.Li Lei works in England . He comes to China______.A.three time a yearB.three times a yearC.three times year