单项选择题

He had a (n) ________habit of emptying ash trays out of his upstairs window onto our doorstep.

A．disgusting
B．offensive
C．uneducated
D．offending
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单项选择题
He is planning another tour abroad, yet his passport will ________at the end of the month.
A．expire
B．exceed
C．terminate
D．cease
单项选择题
The polar explorers took every precaution to ________the dangers of their trip.
A．optimize
B．standardize
C．energize
D．minimize
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