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2. Be willing to be active in finding solutions and protect the environment.教学重难点重难点: 模仿本课句式描述人口与环境类的问题，并提出解决方案。教学策略创设情境法（situational approach）
任务型教学法(task-based approach)学习策略自学策略：迅速获取文章信息，归纳重点句式。
合作学习：小组合作，共同谈论，明确分工，完成任务。教学准备多媒体设备、课上练习题教
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程教学过程教师活动学生活动目的Step 1.
Lead-inPlay a short video about the population in China.
Ask students:
Q1. The video shows the population of three big cities, they are …
So why do people move to cities?
Q2. Since big cities are so good, if we all move there, will it cause many problems?
What are the problems of big cities?
（Give words to help them）Watch the video and think about the two questions:
Q1. Why do people move to cities?
Q2: What are the problems of big cities?播放关于人口的视频，吸引学生兴趣，引发他们联系生活实际，思考大城市的问题所在，从而引出新单词的学习。Step 2.
Pre-taskAsk students to work in pairs, one asks ”what are the problems in big cities” and one answers.
Learn new words with recordings and examples.
Use them to make a conversation in pairs.Read after the teacher. Repeat and remember.
work in pairs, discuss the problems with words offered.播放录音，展示例句，学习新单词并运用这些单词进行对话练习，实时巩固，为后面阅读做准备。
Step 3.
While-taskGive each group an envelope with the five paragraphs of this passage inside.
Ask them to put them into a correct order.
Analyze the passage paragraph by paragraph.
1). Paragraph 1. listen and fill in the blanks.
2) Paragraph 2. read and answer two questions.(why do people move to Arnwick? Where does Jo’s family live now?)
3) Paragraph 3. read and decide true or false.(①Jo now goes to school in Arnwick because it’s not far away ②Traffic is a problem in Arnwick.)