37 萬里長城的主要關口,由東往西排列依序為:
(A)山海關→嘉峪關→雁門關→居庸關
(B)山海關→雁門關→居庸關→嘉峪關
(C)山海關→嘉峪關→居庸關→雁門關
(D)山海關→居庸關→雁門關→嘉峪關

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統計: A(5), B(16), C(16), D(33), E(0) #1018627