题目

— Oh, Jackie, you know so much about Paris.               — Well, I lived there ______.        A. at times                    B. for a time          C. at a time                   D. at all times 答案:B有两个班的学生分别在M、N两处参加植树活动,现要在AB、AC交叉区域内设一个茶水供应点P,使P到两条道路的距离相等,且使PM=PN.请图中作出符合条件的点P,不写作法,但要保留作图痕迹.
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