单项选择题

%he 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
I bought an alarm dock with a(n)______ dial, which can be seen dearly in the dark.
A．audible
B．amplified
C．supersonic
D．luminous
单项选择题
This disease ______itself in yellowness of the skin and eyes.
A．manifests
B．modifies
C．magnifies
D．exposes
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