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Unit 1 Grass and Trees 1
Unit 2 Insects ＆ Animals 25
Unit 3 Water 49
Unit 4 Food Safety 73
Unit 5 Mysteries of Plants 99
Unit 6 Animals'Life 121
Unit 7 Biotechnology 145
Unit 8 The Growth of Plants 171
附录一 农林类词汇 196
附录二 课文参考译文 203