单项选择题

The incidence of this disease has been greatly reduced thanks to our health care program.

A．seriousness
B．frequency of occurrence
C．mortality
D．cure rate
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单项选择题
Growing economic problems were highlighted by a slowdown in oil output.
A．accounted for
B．worked out
C．made prominent
D．taken for granted
单项选择题
I was most favorably struck by the assurance with which the boy answered all my questions.
A．insurance
B．confidence
C．reluctance
D．independence
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