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
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
单项选择题
______ the heavy rain we stayed at home the whole morning.
A．Owing to
B．But for
C．Instead of
D．Due of
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