根据提供的信息和语言素材设计教学方案，用英文作答。
设计任务：请阅读下面学生信息和语言素材，设计20分钟的英语听说教学方案。
该方案没有固定格式，但须包含下列要点：
·teachingobjectives
·teachingcontents
·keyanddifficultpoints
·majorstepsandtimeallocation
·activitiesandjustifications
教学时间：20分钟
学生概况：某城镇普通中学初中一年级(七年级)学生，班级人数40人，多数学生已经达到《义务教育英语课程标准(2011年版)》二级水平。学生课堂参与积极性一般。
语言素材：
Teaching Contents: These three passages are about the descriptions of friends and the things they do together.
Teaching Objectives:
(1) Knowledge objectives
Students can learn some new words and expressions such as "chubby, athletic" to describe a friend's appearance,character, interests and what they like to do.
(2) Ability objectives
①Students can develop the ability to describe a friend' s appearance, character, interests and what they like to do.
②Students can improve their listening and speaking skills.
(3) Emotional objectives
Students can get a deeper understanding about friendship and strengthen the friendship with friends.
Teaching Key and Difficult Points:
(1) How to make students learn to describe a friend.
(2) How to make students improve the listening and speaking skills.
Major Steps:
Step 1 Pre-listening (5 minutes)
The teacher asks students the following questions:
(1) Who is your best friend What does he/she look like'
(2) What does he/she like to do What do you usually do
(Justification: Questions about students' friends can arouse their interest and prepare them for the class.)
Step 2 While-listening (9 minutes)
(1) Listen to the tape and fill in the blank.
(2) Listen to the tape again and finish the following question of each person: What do you like to do together
(Justification: This step helps students to get a better understanding about the listening material.)
Step 3 Post-listening (6 minutes)
(1) Show the tape scripts on the PPT.
(2) Group discussion: Talk about your ideal friends.
Then the teacher asks some students to share their ideas, then makes a conclusion about friendship andemphasizes the importance of friendship.
(Justification: This step helps students to train their speaking abilities and further their understanding aboutfriends and friendship.)
(备注：本方案设计是按照PWP模式设计的，以“听力”为主线，在听的过程中穿插“说”的活动，以提升学生的听说能力，也可以依据3P模式进行设计。)
