unit 1 ag ricultu re农业 lead—in text a industry must hel to fill the world s rice bowl text b advice on ag—tourism 0 text c brief history of agriculture 5 uflit 2 animai science动物科学 lead—in text a woman who lost leg finds insiration from disabled dolhin text b 10 ways to lan for air travel with your dog text c rescue dogunit 3 food食品 lead-in text a celery is an ancient healing food text b avoid high fructose corn syru in beverages and rocessed foods text c 15 fat—burning foodsunit 4 genetically modified technology转基因技术 lead-in text a bt．corn：what it is and how it works? text b breakthrough：food for the 21 st century i text c egglant getting more valueunit 5 environmental rotection环境保护 lead-in text a meat—eaters soak u the world’s water text b what is the greenhouse effect? textc naturalgasunit 6 water conservation水资源利用 lead-in text a seawater toilets hel flush away water shortages text b university’s laser exeriment may revolutionizeirrigation，save water textc 11 waystoconservewaterinthehomeunit 7 fishing渔业unit 8 horticulture园艺unit 9 forestry林学unit 10 agricultural mechanization农业机械化unit 11 insects昆虫unit 12 agricultural economy农业经济taescrit课文参考译文练习答案
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