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Step 2 discussion Read experts’ viewpoints and discuss which of the viewpoints from experts they agree with and which viewpoint their group will focus on. [Explanation] 沙漠化這一話題太大,影響學生海報的制作,因此學生通過討論,確定本組海報的宣傳焦點,為學生的海報制作降低難度。 Step3 design a poster (PPT 49) 1. How to design a poster. (PPT 58) 1) Heading catching, simple, able to be seen from 20 feet away. 2) Con