题目

Family membersWhat does he/she look like?My fatherMy father is tall. He has curly hair. He's handsome.My motherMy mother is beautiful. But she is short. She has black hair.My sisterMy sister is a lovely girl. She has long black hair. She's of medium build.My brotherMy brother looks like my mother. He is short, too. And he is heavy. 【1】What does the writer's（作者的）father look like?A.He is tall and has black hair. B.He is tall and has curly hair.C.He is of medium build. D.He is short and has curly hair.【2】Who is short and heavy?A.The writer's mother. B.The writer's father.C.The （1）如图1为“用DIS研究加速度和力、质量的关系”的实验装置．（1）（多选）有关该实验正确的是______A．实验中小车必须每次从同一位置释放B．改变钩码数量时导轨的倾斜角度不需改变C．当钩码数量变化时小车的质量应保持不变D．钩码连接小车的细线不必平行于轨道（2）改变所挂钩码的数量，多次重复测量，得到a-F关系图线（如图2所示）．此图线的AB段明显偏离直线，造成此误差的主要原因是______A．小车与轨道之间存在摩擦B．导轨保持了水平状态C．所用小车的质量太大D．所挂钩码的总质量太大．