lesson34savingtheearth课件
日期：2010-05-25 05:58
Saving the earth
Lesson 34 Unit 9
Earth， Air and Water
制作：砀山二中 张建军
area
cattle
cause
limit
gradually
In place
hillside
blow away
power station
mile
chemical rain
time and time again
Russia
lose one’s sight
shore
present
dirty
tanker
pour
square k，
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