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tiger
giraffe
panda
kangaroo
monkey
bear
penguin
dolphin
再次复习单词，引出视频分类内容
lion
tiger
giraffe
panda
kangaroo
monkey
bear
penguin
dolphin
Watch a video
Many animals are
These and many other animals are
Tigers are .
They are .
in danger
disappearing
Elephants are .
They are .
in danger
disappearing
Deer are .