单项选择题

The university has launched a research center to develop new ways of ______ bacteria which have become resistant to drug treatments.

A．regulating
B．halting
C．interrupting
D．combating
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单项选择题
The continuous rain ______ the harvesting of the wheat crop by two weeks.
A．set back
B．set off
C．set out
D．set aside
单项选择题
They are trying to ______ the waste discharged by the factory for profit.
A．expose
B．exhaust
C．exhibit
D．exploit
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