What does the passage mainly discuss? It can be inferred from the statement about mother chimpanzees and their young (lines 21

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问题  What does the passage mainly discuss?
  It can be inferred from the statement about mother chimpanzees and their young (lines 21-23) that young chimpanzees have difficulty

选项 A、communicating with their mothers
B、adding quantities
C、making choices
D、opening hard nuts

答案D

解析
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