单项选择题

A．Boarding time.
B．Departure gate.
C．Flight number.
D．Check-in time.
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单项选择题
When the athlete experienced ______ heartbeats and pain in his left arm, the trainer sent him to the emergency room.
A．irregular
B．derivative
C．primary
D．multiple
单项选择题
In recent years, teachers far outnumber the available teaching positions in many ______ in the US.
A．items
B．disciplines
C．conferences
D．projects
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