A．They could tell wind direction.B．They could bring good luck to fighters.C．They were
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A．They could tell wind direction.
B．They could bring good luck to fighters.
C．They were handed down by the ancestors.
D．They were believed to stand for natural forces.
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正确答案：D
解析：选项均指出了They(flags)的某种意义。短文先是指出一些自然现象，如...tell the direction of the wind was more dependable than earlier methods, such as watching the rising of smoke from a fire，然后指出“旗帜与自然力联系到一起是很合理的”，因此答案为D项。