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Unit 2 Working the land Using Language词汇知识·自主学习Ⅰ. 用本单元适当的单词补全短语1. _______the students使学生迷惑2. have no ______没有遗憾3. ________change化学变化4. at each stage of __________在生产的每个阶段5. make an important _________有重大发现confuseregretchemicalproductiondiscoverysoil6. keep the ___dry保持土壤干燥7. ______pollution and waste减少污染和浪费8. _________the topic sentence画底线标出主题句9. _____the passage略读课文?10. make a ________发表评论11. the ____of the problem问题的根源reduceunderlineskimcommentrootⅡ. 根据语境用适当的词补全句子1. In addition __my studies, I got involved in lots of social activities. 2. His confidence built ___gradually as he gained more and more experience in teaching. 3. You’d better turn to your teachers and classmates ___help when meeting with any difficulties in study. 4. ___ we all know, success lies in hard work while laziness l