单项选择题

Safety is always our primary concern.

A. least
B. secondary
C. last
D. chief
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单项选择题
The police arrested the suspect yesterday and released him this morning.
A. freed
B. relieved
C. kicked
D. liberated
单项选择题
Charges for local telephone calls are outrageous.
A. unheard of
B. unacceptable
C. unbelievable
D. ridiculous
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