单项选择题

People today have to a great _________ lost their ability to identity with what they do.

A．point
B．ratio
C．extent
D．rate
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单项选择题
It is generally believed that swimming is one of the best ways for a person to _________ good health.
A．reserve
B．sustain
C．preserve
D．maintain
单项选择题
If only we _________ then the disease was curable.
A．knew
B．could know
C．had known
D．would have known
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