单项选择题

Officials fear that extremists may ______ to violence.

A．certify
B．confine
C．retort
D．resort
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单项选择题
After the death of the king, his two sons asserted their right to the ______.
A．thrill
B．thirst
C．thorn
D．throne
单项选择题
Britain and Portugal have had ______ relations for more than four centuries.
A．cosy
B．cordial
C．cynical
D．customary
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