题目内容
Scientists have found that they have an ____ identity and a ____ identity.
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What’s more amazing is they have even a ____ identity besides individual identity and group-level identity, so they can distinguish between ____, ____ neighbors, and ____ just like humans.
Well, all the ____, such as chimpanzees and gorillas, can-learn American Sign Language.
But what is amazing to me is that each kind of ape can ____ the sign language to others of their ____.
Distant, aggressive wolves and dogs stand tall with their ears ____, and their head ____ high. They show their teeth, and raise their fur so that they ____. They may give a loud bark.
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