题目

如图，将三角尺的直角顶点放在直尺的一边上，∠1=30°，∠2=50°，则∠3的度数 等于（ ）A．20° B．50° C．30° D．15° 答案：【答案】A.【解析】试题分析：根据平行线的性质，得∠4=∠2=50°．∴∠3=∠4-∠1=50°-30°=20°．故选A．考点: 1.平行线的性质；2.三角形的外角性质．?What do you think of George? ?He's a man of ________ words. He always stays alone. A. little B. much C. few D. many