题目内容：
根据题目要求完成下列任务，用中文作答。以下是某堂课老师的教学材料：
Betty: Hi Mum, can you hear me?
Mum: Yes, I can. Where are you?
Betty : I' m standing on the Great Wall of China and talking to you.
Mum: Really?
Betty: We're on a school trip and we've having lunch. And we're lying in the sun and we' re taking lots of photos.
Mum: That's great, Betty. What are the others doing?
Betty: Well, Tony is eating an ice cream, and Lucy is buying some presents and postcards.
And Tom is eating lunch and lying in the sun.
Mum: Can you send me a post card?
Betty: Yes. Lucy and I are writing postcards. We're enjoying the school trip a lot. Anyway,
we're going home now. Bye!
Mum: Bye bye, Betty!
任务要求：根据材料内容回答以下三个问题。
(1)这份材料属于哪种语篇类型?(7分)
(2)这份材料适合于哪种课堂教学?说明理由(至少写出两个要点)。(8分)
(3)分析教师选用文本材料时需要考虑的基本要素(至少写出三个要点)。(15分)
参考答案：
答案解析：