摘要：教师要挑选一些相关的课文段落让学生背诵.让学生练习恰当的使用在写作中.使文章增色. 例:关于环保的话题, 高二上8单元 Experts from all over the world spoke about different topics and discussed new ways to solve old problems. Most of the speakers talked about the “big three , the three biggest killers in the world contaminated drinking, poor sanitation and air pollution. Stress the need for equality and fairness in the world. Rich countries have a responsibility towards poor countries and must do what ever they can to help others. Without international cooperation, developing countries cannot prosper, nor will sustainable development b3e possible.

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