单项选择题

How many revolutions must the largest cog make in order to bring the cogs back to their original positions

A．56
B．48
C．36
D．12
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单项选择题
BONA FIDE is to genuine as DE FACTO is to________.
A． together
B．actual
C． reason
D．assumed
单项选择题
What letter should replace the question mark
A．T
B．S
C．I
D． N
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