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
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
单项选择题
The shop they entered was______.
A．a tailor's shop
B．a second-hand clothing store
C．a clothing store
D．none of the above
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