单项选择题

The tragedy could have been ______ if the crew had followed safety procedures.

A．converted
B．diverted
C．reverted
D．averted
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单项选择题
Relations between the countries were formally ______ in 1997.
A．mechanized
B．normalized
C．modernized
D．standardized
单项选择题
The solution, if that is the case, is to install a pressure-reducing ______ on the water system.
A．shaft
B．shelf
C．axis
D．valve
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