单项选择题

A．At a police station.
B．At the doctor’’s office.
C．In an operating room.
D．In a hall.
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单项选择题
A．It’’s cheap.B．It’’s healthy.C．It’’s faster.D．It’’s interesting.
A．It’’s cheap.
B．It’’s healthy.
C．It’’s faster.
D．It’’s interesting.
单项选择题
The word imperative ( Line 4, Para. 1) most probably refers to something ________.
A．superficial
B．remarkable
C．debatable
D．essential
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