单项选择题

To conserve energy, estate developers are encouraged to build houses that can retain heat in winter.

A．attain
B．keep
C．release
D．generate
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单项选择题
To suppress this uprising completely seemed to be too difficult a mission to these officials.
A．advocate
B．conceal
C．uphold
D．crush
单项选择题
He was thoughtful and grave—but the orders he gave were enough to bewilder a crew.
A．exasperate
B．convict
C．dispatch
D．perplex
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