单项选择题

We must try to ______ the best of our moral values for our children and grandchildren.

A．replace
B．remain
C．generate
D．preserve
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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 jet quickly ______ into the sky and soon went out of our view.
A．ascended
B．launched
C．assessed
D．descended
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