单项选择题

The text is written_________.

A．to help to sell antifreezes
B．to explain what antifreezes are
C．to compare ethylene glycol with alcohol
D．to tell what kind of antifreeze to choose
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单项选择题
Preston and Xerox are__________.
A．trade names of two kinds of alcohol
B．popular manes of car engines
C．liquids used for car engines
D．trade names of a kind of antifreeze
单项选择题
Alcohol is seldom used as an antifreeze because___________.
A．it boils away easily
B．it is too expensive
C．it becomes hot easily
D．it freezes easily
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