单项选择题

Antifreezes are so useful that they__________.

A．can prevent ice from melting
B．keep alcohol from boiling away
C．keep water from freezing in very cold water
D．can raise the freezing point of water
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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
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
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