设计任务：阅读下面学生信息和语言素材，设计20分钟的英语听说教学方案，教案没有固定格式，
但需要包含下列要点：
① Teaching objectives
② Teaching contents
③ Key and difficult points
④ Major steps and time allocation
⑤ Activities and justifications
教学时间：20分钟
学生概况：某城镇普通中学九年级（初中三级）学生，班级人数40，多数学生已达到义务教育英语课程标准的相应水平。学生积极参与积极性一般。
Clara: Guess what? I’m going to Chiang Mai two weeks.
Ben: Wow, sounds like fun! But I believe that April is the hottest month of the year there.
Clara: Yes, that’s true, but there is a water festival there from April 13 to 15.
Ben: I wonder if it’s the same as the water Festival of the Dai people in Yunnan Province.
Clara: Yes, I think so. This is the time of Thai New Year. People go on the streets to throw water at each other.
Ben: Cool! But why do they do that?
Clara: Because the New Year is a time for cleaning and washing away bad things. Then you’ll have good luck in the new year.