单项选择题

Agriculture was a step in human progress ______ subsequently there was nothing comparable until our own machine age.

A．to which
B．signal
C．from which
D．in which
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单项选择题
Chaucer has been called the Father of Poetry by ______ generations.
A．aggressive
B．progressive
C．successive
D．comprehensive
单项选择题
Experience leads me to think that it is not always good to get ______ with strangers.
A．tolerant
B．confidential
C．enthusiastic
D．agreeable
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