单项选择题

It is still not clear what ______ a series of argument between them.

A．contributed
B．marked
C．ignited
D．triggered
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单项选择题
Humans should not develop their economy at the ______ of the ecological environment.
A．destruction
B．pollution
C．expense
D．mercy
单项选择题
The search for the lost ship must be ______ because of poor weather.
A．released
B．resigned
C．abandoned
D．surrendered
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