单项选择题

Agriculture was a step in human progress ______ which subsequently there was not anything comparable until our own machine age.

A．in
B．for
C．to
D．from
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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
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
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