题目内容
He isn’t counted as knowing a new world unless he’s used it at least ____ in a meaningful way.
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Scientists have found that they have an ____ identity and a ____ identity.
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 ____.
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