单项选择题

John was irritated by the necessity for polite conversation.（）

A．annoyed
B．troubled
C．threatened
D．aroused

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单项选择题
Ten years after the event, her death still remains a puzzle. （）

A．mist
B．fog
C．mystery
D．secret
单项选择题
Many economists have given in to the fatal lure of mathematics.（）

A．attraction
B．simplicity
C．power
D．rigor
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