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

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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.

单项选择题

It can be inferred from the passage that students' attitude towards campus commercials is that they think______.

A．the issue is more about freedom.
B．it is more conflicting than common.
C．education becomes a billboard.
D．that they must investigate more.