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
Early exponents of science fiction such as Jules Verne and H. G. Wells explored with zest the future possibilities opened up to the optimistic imagination by modern technology.
A．inspiration
B．enthusiasm
C．fantasy
D．endeavour
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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