单项选择题

The basic features of the communication process are identified in one question: Who says _________ through what channel to whom

A．what
B．when
C．how
D．such
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单项选择题
All the key words in the article are printed in _________ type so as to attract readers' attention.
A．dark
B．bold
C．dense
D．black
单项选择题
_________ receiving financial support from family, community or the government is allowed, it is never admired.
A．Once
B．Lest
C．As
D．Although
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