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
Mr. Smith became very _________ when it was suggested that he had made a mistake.
A．ingenious
B．empirical
C．objective
D．indignant
单项选择题
In our highly technological ,society, the number of jobs for unskilled workers is
A．shrinking
B．obscuring
C．altering
D．constraining
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