单项选择题

A．Breakdown of public health.
B．International travel and commerce.
C．Man’s eating habits.
D．Processing methods of food.
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单项选择题
A．Computer failure.B．Clash of another planet with the satellite.C．Wrong operation.D．Designing mistakes.
A．Computer failure.
B．Clash of another planet with the satellite.
C．Wrong operation.
D．Designing mistakes.
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