Water pollution-水源污染
Water is used in homes, in farming, and in manufacturing. The water used by the people comes from oceans, lakes, rivers, and streams. Many water sources are becoming polluted. People are throwing things into the water. Factories are dumping waste materials into the water. Cities are dumping sewage into the water. Some water sources have become so badly polluted that the water cannot be made fit to use. Would you like to drink water that came from a source that had been so badly mistreated? Now is the time that we should take up our responsibility to protect our environment from being polluted.
冀教版(三起)四下《Lesson 1 Welcome Back》ppt课件2
冀教版英语四下《Unit 4 Lesson32 Again please》PPT课件[www.edudown.net]
冀教版(三起)四下《Lesson 1 Welcome Back》ppt课件
冀教版(三起)四下《Lesson 19 What Are You Wearing》ppt课件1
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冀教版(三起)四下《Lesson 2 Friends》ppt课件1
冀教版(三起)四下《Lesson 14 What Time Is It》ppt课件1
冀教版(三起)四下《Lesson 18 Are You Short or Tall》ppt课件1
冀教版(三起)四下《Lesson 19 What Are You Wearing》ppt课件
冀教版(三起)四下《Lesson 11 When Is It》ppt课件
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冀教版(三起)四下《Lesson 18 Are You Short or Tall》ppt课件2
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冀教版(三起)四下《Lesson 17 How Old Are You》ppt课件2
冀教版(三起)四下《Lesson 11 When Is It》ppt课件3
冀教版(三起)四下《Lesson 14 What Time Is It》ppt课件2
冀教版(三起)四下《Lesson 20 Where Do You Live》ppt课件
冀教版(三起)四下《Lesson 11 When Is It》ppt课件1
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冀教版(三起)四下《Lesson 25 My Favourite Colours》ppt课件
冀教版英语四下《Unit 4 Lesson29 What do you like to do》PPT课件2[www.edudown.net]
冀教版(三起)四下《Lesson 19 What Are You Wearing》ppt课件3
冀教版(三起)四下《Lesson 10 First Second Third》ppt课件
冀教版(三起)四下《Lesson 19 What Are You Wearing》ppt课件2
冀教版(三起)四下《Lesson 10 First Second Third》ppt课件1
冀教版(三起)四下《Lesson 18 Are You Short or Tall》ppt课件
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