单项选择题

Ten years after the event, her death still remains a puzzle.

A．mist
B．fog
C．secret
D．mystery
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单项选择题
Many economists have given in to the fatal lure of mathematics.
A．simplicity
B．attraction
C．power
D．rigor
单项选择题
These paintings are considered by many to be authentic.
A．faithful
B．royal
C．sincere
D．genuine
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