学习几何 ,首先必须会正确地识图与画图 .如果连一个几何图都看不懂 ,甚至画不出符合要求的图形 ,以后的证明就无从谈起了 .现将有关“直线、射线、线段”的识图与画图方面的错误剖析如下 :例 1　如图 1,A、B、C、D是直线 MN上的 4个点 ,则图中线段共有 (　　 )M 图 1A BNDCA.3 In learning geometry, we must first correctly understand and draw drawings. If even a geometric figure can’t read, or even draw a picture that meets the requirements, the future proofs won’t be discussed. Now we will talk about “straight lines, rays, and line segments.” The error analysis of drawing and drawing is as follows: Example 1 As shown in Figure 1, A, B, C, and D are four points on the straight line MN, and the lines in the drawing are common () M Figure 1A BNDCA.3