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
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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
单项选择题
The Mayan calendar far more accurate than the European calendars of the time most probably because ______.
A．the Mayan numbers enabled the Mayan priests to study planets
B．the European countries had no interest in founding a calendar
C．the European calendars of the time probably were made by a guess work
D．the year was divided into 18 months of 20 days each with five days left over
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