题目

【2019 • 湖北省襄阳】 When I saw Ronny for the first time, he looked like other kids in the first-grade classroom where I volunteered as a Reading Mom. However, he usually arrived at school wearing old clothes. On the day when it was Ronny’s turn to read. he sat very close to me. I watched his fingers move slowly under each letter as he tried to speak out “Bud the Sub”. It sounded more like “Baw Daw Saw” when he said it because of his difficulty with the alphabet (字母). The year passed quickly and Ronny had made some progress but he was still below the level of gr18．在做“验证力的平行四边形定则”的实验中：①某同学准备了以下器材，其中多余的器材是D（选填序号）；A．方木板      B． 图钉（几个）      C．白纸D．天平        E．刻度尺             F．测力计（两只）G．橡皮条      H．细线套（两个）     I．铅笔②某同学根据实验数据画出力的图示，如图所示，图上标出了F1、F2、F、F′四个力，其中F′（填上述字母）不是由弹簧秤直接测得的；若F与F′的大小和方向都基本相同，说明共点力合成的平行四边形定则得到了验证．