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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(xué)生海報(bào)的制作,因此學(xué)生通過(guò)討論,確定本組海報(bào)的宣傳焦點(diǎn),為學(xué)生的海報(bào)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