题目

Is his action consistent ______ his principles?a. with b. in c. of d. by 答案：A如图，已知CD为⊙O的直径，过点D的弦DE平行于半径OA，若∠D的度数是50°，则∠C的度数是（ ）A．50°B．40°C．30°D．25°