题目

My name is Becky Smith. I’m eleven years old. I have one brother. His name’s Jason and he’s fourteen. I don’t have any sisters. We live with grandma in a small house in Chesterfield(城市名，切斯特菲尔德), in the north(北部) of England. My friends and I often go to the cinema on Saturday. Do you like games? I like football. My favourite team is Manchester Unite(曼联队). I sometimes play football with my brother. I have seven pets: two birds and five goldfish. I want a dog and a cat, but my parents don’t like them.Do you want to be my pen friend? Please write to me soon.丁俊晖在某次比赛中，母球遇到障碍球的直线阻挡，而不能直接击中目标球（A是母球，B是障碍球，C是目标球）．丁击出的母球不能击中目标球，造成失分．请你利用平面镜成像和光反射的物理规律告诉他知识的用处：母球借助球桌边缘（相当于镜面）的一次反弹，躲开障碍球，击中目标球．在图中作出母球的运动轨迹及必要的作图痕迹．