单项选择题

If refrigerated, USDA eggs will remain good for ______ weeks from the date stamped.

A．four to five
B．three
C．two to three
D．six to seven
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How many types of motors are generally used in the shaver
A．Two.
B．Three.
C．Four.
D．Not known.
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According to the passage, which is the principal energy source of home heat
A．Wood.
B．Coal.
C．Natural gas.
D．Petrol.
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