上学期Unit9savingtheearth课件
日期：2010-06-07 06:12
Saving the
Unit 9
advantages
high speed
convenience
symbol of success
disadvantages
traffic accidents
more gas consumed
air pollution
air pollution
Coal burned by a power station (ten thousand ton)
1999
2000
2001
2002
2003
0
200
400
600
800
1000，
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