单项选择题

The incidence of this disease has been greatly reduced thanks to our health care pro- gram.

A．seriousness
B．frequency of occurrence
C．mortality
D．cure rate
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单项选择题
Because alcohol is a solvent, it is a component of many liquid medicines.
A．basic ingredient in making medicines
B．combination of things of different qualities
C．one of the parts that make up a whole
D．substance that helps to cure certain diseases
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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