Unit 4
Global warming
Words and Expressions
I.重点词汇
consume   2. renewable  3. tend  4. opposed    5. mild   6. environmental; environmentalist7. consequently; consequence8. state      9. steady 10. exist; existence  11. commitment  12. pollution  13. growth    14. electrical  15. refresh    16. educator 17. contribution  18. disagreement
II.重点短语come about 2. random 3. subscribe  4. of  5. up 6. in  7. opposed  8. as  9. from; to  10. if/though11. on  12. at  13. whole  14. average  15. on  16 ...