单项选择题

The skin of potatoes is removed by ______.

A．knife peeling
B．grinding with each other
C．workers attending the machine
D．water washing
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单项选择题
The author wants to convey the idea in the last paragraph that ______.
A．the flavor of chicken gravy added to potatoes can provide better taste
B．the potato has its own specific role to play
C．potatoes may be made use of in many ways
D．no one can make potatoes taste like chicken
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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