题目

按要求变化下列各句【1】Our teacher is writing on the blackboard. （一般疑问句）____ your teacher ____ on the blackboard?【2】Do your homework at school.（否定句）_____ ____ your homework at school.【3】Ann is wearing a yellow skirt. （同义句变化）Ann _____ ___ a yellow skirt.【4】I think I can make cakes. （否定句）I _____ ____ I can make cakes.【5】There istwobabies on the bed. （对画线部分提问）_____ ____ babies are there on the bed?【6】I can seea lighton the table. （对画线部分提问）_____ ____ you ____ on the table?【7】That （坐标系与参数方程选做题）在直角坐标系xOy中，已知曲线C1，（为参数）与曲线C2：，（θ为参数）相交于两个点A、B，则线段AB的长为    ．