单项选择题

From the passage we learn that human brains.

A．improved the art of speech exclusively
B．developed only with the use of tools
C．and the art of speech had a mutual improvement
D．accorded with languages that stimulate them

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热门试题

单项选择题

The main point of this passage is ______.

A．evolution of speech
B．darwin's law of natural selection
C．progress of human brains
D．evolution of human intelligence