Unit 5　Look into Science习题课件（9份打包）

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(共8张PPT)
单元语法专训
Unit 5　Look into Science
[课堂回顾]
1. In Mexico， the butterflies always return to thesame small piece of
forest，which is only 20 kilometres wide.
2. But in Mexico， people cut down the trees that the butterflies need to rest
on because they want more land for farming.
3. Your DNA has bil...