教学情境分析22.下面片段选自某初中英语课堂教学实录。 Topic: Save our world Knowledge objectives: Words: reduce, reuse, necessary, plastic , chins, fashion, instead, cloth, sort, harm, difference: Phrase: do harm to, make a difference, care about, it's necessary to do. Step 1 1. Students read the words in the box after the teacher and then talk about some pictures with the words in the box. "It's better to recycle paper than to burn it. " … 2. To discuss the six questions in the passage to see if you are a green man. Step 2 Teacher explains the following phrases and some difficult sentences of the passage. ① do harm 进而解释 harm的其他用法 ② it's necessary to do ③ make a difference to ④ care about ⑤ instead of 请根据该教学片段回答下面三个问题: (1)该教师的教学环节有哪些优点及缺点。(10分) (2)请结合词汇教学的原则,提出合理化的建议。(10分) (3)列举词汇呈现的策略。(10分)