题目

如图，小红用一张长方形纸片ABCD进行折纸，已知该纸片宽AB为8cm，长BC为10cm．当小红折叠时，顶点D落在BC边上的点F处（折痕为AE）．想一想，此时EC有多长？ 答案：由条件可以推得FC=4，利用勾股定理可以得到EC=3cm．Today, the forests have almost gone. People must _______ down too many trees.A.stop to cutB.stop from cuttingC.be stopped to cutD.be stopped from cutting