题目

仿照例句，改写句子。例: She can take pictures. She took pictures last Sunday.1. I can play the piano. I __________ the piano last Sunday.2. He can make a poster. He __________ a poster last Sunday.3. They can swim. They __________ last Sunday.4. She can sing songs. She __________ songs last Sunday. 答案：【答案】1. played 2. made 3. swam 4. sang 【解析】略要用一根绳子和两个滑轮提起物体，若不计滑轮重及摩擦，而使拉力为物体重的请在图中画出绳子的正确绕法．