题目

When he was alive, the old scientist used to say that knowledge ____ from practice and he gained his experience by doing a lot of practical work. A. was coming      B. had come              C. comes              D. would come 答案：C13．如图是由6个棱长都为1cm的小正方体搭成的几何体．（1）该几何体的主视图如图所示，请在下面方格纸中高分别画出它的左视图和俯视图；（2）该几何体的表面积为26cm2．