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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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
It ______ you didn’t get the ticket. The play wasn’t good anyway.
A. is all right
B. is just as well
C. doesn’t matter
D. serves you right
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