单项选择题

A person's calorie requirements vary ______ his life.

A．across
B．throughout
C．over
D．within

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单项选择题

A survey was carried out on the death rate of new-born babies in that region, ______ were surprising.

A．as results
B．which results
C．the results of it
D．the results of which

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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