单项选择题

What does "paying attention" mean in the 4th paragraph

A．Putting concentration on unexpected things.
B．Looking closely at unexpected things.
C．Expecting without knowing what to expect.
D．Being careful with unexpected things.

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单项选择题

Which word is closest in meaning to the word reinvent' (last sentence, Paragraph two)

A．recreate.
B．reinforce.
C．reproduce.
D．reexamine.

单项选择题

What can be preceded according to the passage

A．The evolution of speech in the long run.
B．The time when early man mastered language.
C．Description about the Ice-Age climate.
D．Other factors functioned in the evolution of human brains.