目录：
Unit 1 Not Too Short
Unit 2 Never Give Up
Unit 3 Yang LiWei's Mission to Space
Unit 4 Review
Unit 5 Animals Helping People
Unit 6 The Magic Trick
Unit 7 An Amazing Plant
Unit 8 Review
Unit 9 Preparing for the Future
Unit 10 The Future World
Unit 11 Ender's Game
Unit 12 Review
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