设计任务：请阅读下面学生信息和语言素材，设计20分钟的英语听力教学方案。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.I 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. I 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.