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

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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

单项选择题

Since the energy crisis, these big cars have become a real liability. They cost too much to run.

A．lack of reliability
B．substitute
C．costly means of transport
D．disadvantage