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一选择题1.(益阳)如图1,点A是直线l外一点.在l上取两点B、C,分别以A、C为圆心,以BC、AB的长为半径画弧,两弧交于点D.分别连接AB、AD、CD,则四边形ABCD一定是().A.平行四边形B.矩形C.菱形D.梯形2.(聊城)如图2,四边形ABCD是平行四边形,点E在边BC上.如果点F是AD边上的点,那么△CDF与△ABE不一定全等的条件是().A.DF=BE B.AF=CE C.CF=AE D.CF∥AE3.(烟台)一个由小菱形组成的装饰链,断去了一部分,剩下的部分如图3所示.则断去部分的小菱形的个数可能是().
A multiple-choice questions 1. (Yiyang) Figure 1, point A is a point outside the straight line l take two points l B, C, respectively, A, C as the center to BC, AB for the length of the arc as the arc, two Arc intersection at point D. were connected AB, AD, CD, then the quadrilateral ABCD must be (). A. Parallelogram B. Rectangle C. Diamond D. Trapezoid 2. (Liaocheng) Figure 2, quadrilateral ABCD is a parallelogram, If point F is a point on edge AD, then △ CDF and △ ABE are not necessarily congruent if () .A.DF = BE B.AF = CE C.CF = AE D. CF // AE3. (Yantai) A small diamond-shaped decorative chain, cut off part of the remaining part shown in Figure 3. The number of broken diamonds may be ().