设计任务：请阅读下面学生信息和语言素材，设计20分钟的英语听教学方案。教案没有固定格式，但须包含下列要点：
   ● teaching objectives
   ● teaching contents
   ● key and difficult points
   ● major steps and time allocation
   ● activities and justifications
   教学时间：20分钟
   学生概况：某城镇普通中学高中一年级学生，班级人数40人。多数学生已经达到《普通高中英语课程标准（实验）》五级水平。学生课堂参与积极性一般。
   语言素材：
   M: Hey Betsy, did you hear the great news?
   W: No, Frank ,I haven't. What is going on?
   M: I just got a promotion, and I am going to throw huge party for all of my friends.1 would love it if you would come.
   W: Wow, thanks so much, when is the party?
   M:I am thinking of having it on Saturday .I am hoping there will be 150 people there. This really is a big promotion for me and my family.
   W: Wow, 150 people. That is a lot. This must be a big promotion.1 would love to go. I think it would be a great time.
M:Oh great, the more the merrier .This really is a big deal for me. We can now afford the new house my wife has always wanted. I just hope I don’t  have to put too many hours in. I would hate to lose too much time with  my  family.
W: I can understand that, but let's keep focusing on the bright side. I can't wait for that party.