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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单项选择题

The author in the passage uses the following devices in his writing EXCEPT______.

A．questions
B．narrative
C．analogy
D．comment

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