单项选择题

______ helped them to live a better life than most people of that time.

A．The knowledge of time
B．The knowledge of tools
C．The knowledge of about nature and the world
D．The knowledge of numbers
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单项选择题
This article may be taken from ______.
A．a magazine
B．a literature book
C．an art book
D．a historical book
单项选择题
A．downB．forC．upD．out
A．down
B．for
C．up
D．out
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