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Unit 4 What can;PowerPoint 演示文稿;PowerPoint 演示文稿;Lead-in: Guessi;PowerPoint 演示文稿;PowerPoint 演示文稿;PowerPoint 演示文稿;PowerPoint 演示文稿;PowerPoint 演示文稿;PowerPoint 演示文稿;PowerPoint 演示文稿;PowerPoint 演示文稿;Can the rat swi;PowerPoint 演示文稿;PowerPoint 演示文稿;Can the snake e;PowerPoint 演示文稿;Deep thinking;PowerPoint 演示文稿;PowerPoint 演示文稿;PowerPoint 演示文稿;Act out!;Homework