unit 7 environmentreading aobjectives1 to learn the cause of the greenhouse effect2 to learn how to be a green consumerteaching procedurewarming-up1. cartoon talk2. show some relevant pictures about the pollution. before readingask the questions below: 1. what do you think of these behaviors to the environment?2. do you know what other behaviors human beings harm the environment? during the process, some new words, such as greenhouse effect, atmosphere, cause, food, soil, environmentally friendly, can be imbedded. while reading1. ask students to read the first paragraph and the headings in the review. then try to answer four questions:
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