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．to
B．in
C．for
D．from
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单项选择题
An energy tax would curb ordinary air pollution, limit oil imports and cut the budget ______
A．disposition
B．discrepancy
C．defect
D．deficit
单项选择题
These surveys indicate that many crimes go ______ by the police, mainly because not all victims report them.
A．unrecorded
B．to be unrecorded
C．unrecording
D．to have been unrecorded
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