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
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They have been ______ that company for many years.
A．comparing with
B．dealing with
C．keeping up with
D．combining with
单项选择题
The author raises issues that would most concern which of the following groups
A．Electricians.
B．Environmentalists.
C．Aircraft pilots.
D．Teachers.
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