单项选择题

Proper clothes ______ for much in business. That’s why you see most business people dress formally.

A. count
B. account
C. allow
D. care
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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
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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