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
John said that he didn't quite _________ and asked me to repeat what I had said.
A．snatch up
B．summon up
C．catch on
D．watch out
单项选择题
She remains confident and _________ untroubled by our present problems.
A．indefinitely
B．infinitely
C．optimistically
D．seemingly
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