单项选择题

The war has（）national development by ten years.

A．put away
B．put aside
C．set up
D．set back

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单项选择题

Workers had to work under terrible（）in the preliberation days.

A．situation
B．conditions
C．circumstances
D．environment

单项选择题

We must try our best to protect some of the（）cultural treasures.

A．rare
B．precious
C．valuable
D．worthy

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