根据以下教学片段,回答问题。 教学片段描述:在教学6A Unit 3时设计了以下三个片段。 片段一:为了引出“birthday”这一话题,我与学生进行了以下会话: T: Excuse me. When is your birthday? S1: On February the eleventh. T: Do you know your father's/mother's birthday? S1: ... 片段二:在谈到切蛋糕庆祝生日时,我这样问道: T: Now Helen will cut her birthday cake into pieces. Who do you think should get the first cake? 同学们七嘴八舌地说开了,有的说Helen,有的说Helen's father。 片段三:在最后布置家庭作业时,我布置了这样一个开放性任务,让学生回家以后调查家庭成员的生日。 问题: