单项选择题

The emphasis on the importance of education has spurred scientific research.（）

A．encouraged
B．fastened
C．raised
D．initiated

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单项选择题

Academic records cannot be duplicated.（）

A．borrowed
B．purchased
C．copied
D．rewritten

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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