单项选择题

When he was a post office clerk, secretaries were better paid because ______.

A．they were in shortage
B．they were better trained
C．they worked longer hours
D．they had greater responsibility
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单项选择题
Before the first World War, female secretaries were rare because they ______.
A．wore stockings
B．were not as serious as men
C．were less efficient than men
D．would have disturbed the other office workers
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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