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
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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