unit9savingtheearth课件
日期：2010-07-04 07:54
Saving the earth
Lesson 34 Unit 9
Earth， Air and Water
Lake Baikal
Dunhuang
Gebi
India
Mediterranean Sea
Germany
USA
Alska
China
Russia
EARTH
AIR
WATER
Many parts of the world with large population and plenty of crops have become desert(，
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