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
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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
Chemistry is closely ______ with other studies: physics, biology and so on.
A．corresponded
B．concerned
C．correlated
D．cooperated
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