单项选择题

A ______ is a variety of language that serves as a medium of communication among groups of people for diverse linguistic backgrounds.

A．lingua franca
B．register
C．creole
D．dialect
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单项选择题
The word gruelling in the first paragraph probably means ______.
A．intermittent.
B．incessant.
C．toilsome.
D．numerous.
单项选择题
ECT remains an effective antidepressant treatment partly because ______.
A．it can stimulate the patient to be more active.
B．it can stimulate the brain to grow new blood vessels.
C．it can help a patient recall what has happened.
D．it can help a patient to come to his consciousness.
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