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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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
单项选择题
The man laughed suddenly when______.
A．he found something he was after
B．he realized they had been to a wrong place
C．he caught sight of a strange woman
D．he saw a notice
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