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 envi ronment.

A．destruction
B．pollution
C．expense
D．mercy
单项选择题
As we can no longer wait for the delivery of our order, we have to （） it.

A．postpone
B．refuse
C．accept
D．cancel
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