单项选择题

People like frozen potatoes though they contain less vitamin because ______.

A．they are easy to store
B．they taste better
C．they save trouble
D．they are liked by all
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单项选择题
The hot oils used for frying ______.
A．is kept fresh every day
B．may be used for a week
C．should be changed every 3 days
D．is changed from hour to hour
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