[案例]
    下列教学片段选自某高中英语课堂实录：
    T: Thank you. Look at the picture. We have learned Wang Hui's experiences in England. Today let's talk about how Wang Hui wrote the passage. Open your book and look at the passage. How many paragraphs?
    Ss: Five.
    T: Yes. Let's find out the key words of each paragraph.
    Ss: Way of life; something interesting...
    T: Good. Look at the picture. What's the structure of the passage? A or B?
    Ss: (学生思考讨论) A.
    T: Well, Next. Let's talk about how Wang Hui wrote his life in England. The first paragraph: Wang Hui talked about...
    Ss: Way of life.
    T: Look at the picture. What did Wang Hui say?
    S1: When you meet someone for the first time, you must use Mr or Mrs.
    S2: When you get to know better, you use their first names.
    [问题]

问答题   该片段属于教学中哪两个环节?并分析这两个教学环节的目的。

问答题   请从教学有效性的角度评价这个教学片段(至少写两个要点)。