填空题

The word "tributaries" (Line 3, Para. 1) probably means branch rivers of Amazon.

【参考答案】

YES

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单项选择题

The word exploit (Line 6, Para 3 )means______.

A．develop further
B．oppress
C．make an unfair use of
D．make a full use of

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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