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选修8《Lesson 2 Endangered Species》精品PPT课件优质课下载
2006 Less than 1,800
2014 Only about 1,000
at an alarming rate of 5%-10% a year
10 years later
?
0
extinct adj.
extinction n.
in danger
Snow leopard(雪豹)
Yangtze alligator
(扬子鳄)
Crested ibis（朱鹮）
Tortoise
Rhino(犀牛)
Tibetan antelope(藏羚羊）
Why do animals become endangered?
Habitat Destruction
Pollution
New species introduction and competition
Illegal Hunting and fishing
Small Population Size/ Low birth rate
Natural disasters
habitat
An animal’s ________ is the type of area that it lives in .