Unit 2 Topic 1 Pollution has caused too many problems. Section B课件(共22张PPT)+内嵌音频

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(共22张PPT)
Unit 2 Saving the Earth
Topic 1 Pollution has caused too many problems.
Section B
West Hill
Review
Look and describe the pictures.
1. _____________________ have gone.
2. The water was_______and smellec _____.
3. There were several ________________ pouring _______________ into the stream....