Work in groups. Decide what kind of pollution you want to talk about.
小组练习。决定你们想讨论哪种污染。
. Choose a subject that you care about the most. It could be water pollution,air pollution,etc.
选择一个你们最关心的主题。它可以是水污染、空气污染，等等。
. Find out more information about your subject. Look it up on a website or in a book.
找出更多有关你们的主题的信息。在网站上或书中查一查。
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