The passage focuses on .A． why Pepperberg decided to carry out the experimentB． how Pepperberg proved her theory abottt animals' thoughtsC． the new way of communication Pepperberg proposedD． the problems that Pepperberg faced in the experiment
The passage focuses on .
A． why Pepperberg decided to carry out the experiment
B． how Pepperberg proved her theory abottt animals' thoughts
C． the new way of communication Pepperberg proposed
D． the problems that Pepperberg faced in the experiment
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