lesson62课件
日期：2012-03-05 19:21
执教人：仲春来
surfing
enjoying the sunshine
swimming
blue
oceans
two-thirds
surface
below
salty
35 parts of salt
minerals
clean water
seaweeds
chemicals
Part 2: sea water
Part 3: the Mediterranean
Size:
3700 km long
1800 km wide
Salt :
37-39 parts
lo，
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