单项选择题

Keys should never be hidden around the house since thieves ______ know where to look.

A．virtually
B．initially
C．invariably
D．infinitely
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单项选择题
After several nuclear disasters, a ______ has raged over the safety of nuclear energy.
A．quarrel
B．suspicion
C．verdict
D．controversy
单项选择题
According to a growing number of experts, it is already technically ______ to construct a pioneering space colony, powered by solar energy.
A．practical
B．flexible
C．feasible
D．beneficial
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