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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单项选择题
The passage argues for potatoes because it ______.
A．contains little fat
B．has more vitamin C than most vegetables
C．gives you a full stomach feeling
D．all the above
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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