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
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单项选择题
The police ______ to emergencies in just a few minutes when the accident happened.
A．responded
B．replied
C．adjusted
D．appealed
单项选择题
We must try to ______ the best of our moral values for our children and grand-children.
A．replace
B．remain
C．generate
D．preserve
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