unit 3 教材背景链接课件人教版选修7-302edu教育资源网

unit 3 教材背景链接课件人教版选修7

Classification of whales 　　Whales are huge, intelligent sea mammals. They breathe air through blowholes into lungs (unlike fish who breathe using gills). Whales have smooth, shiny, streamlined (流线型) bodies that move easily through the water.

教材背景链接

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