单项选择题

A．An unexpected event that happens.
B．Your understanding of an event.
C．The things that happen in our lives.
D．The mentioning of the word itself.
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单项选择题
A．In cold areas.B．In warm areas.C．In hot areas.D．In both cold and warm areas.
A．In cold areas.
B．In warm areas.
C．In hot areas.
D．In both cold and warm areas.
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