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

Hundreds of buildings were wrecked by the earthquake.（）

A．damaged
B．shaken
C．fallen
D．jumped

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