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课件36张PPT。本讲栏目开关本讲栏目开关本讲栏目开关本讲栏目开关本讲栏目开关B 本讲栏目开关D 本讲栏目开关To communicate with each other./To communicate hunting or breeding information.make a lot of noise 本讲栏目开关本讲栏目开关本讲栏目开关本讲栏目开关witnessed the car accident witnessed to having seen 本讲栏目开关witnessed give/bear witness witnessed 本讲栏目开关本讲栏目开关本讲栏目开关to conta...