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
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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 art of speech had a mutual improvement
D．reached the present size about a few hundred years ago
单项选择题
What can be preceded according to the passage
A．The evolution of the speech in the long run.
B．The time when early man mastered language
C．Description about the Ice-aged climate.
D．Other factors functioned in the evolution of human brains.
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