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．how
B．when
C．what
D．such
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单项选择题
A person's calorie requirements vary ______ his life.
A．across
B．throughout
C．over
D．within
单项选择题
If I hadn't stood under the ladder to catch you when you fell, you ______ now.
A．wouldn't be smiling
B．couldn't have smiled
C．won't smile
D．didn't smile
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