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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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
单项选择题
The woman in the shop stared at them strangely, because ______.
A．she saw foreigners for the first time
B．they had on funny clothes
C．she wondered why they came into the shop
D．they didn't give her any money
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