单选题:我国古代对外经济文化的交流,前期以陆路为主,而自五代两宋后,变为以海路为主,造成这一转变的直接原因是(  )。

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题目内容:
我国古代对外经济文化的交流,前期以陆路为主,而自五代两宋后,变为以海路为主,造成这一转变的直接原因是(  )。 A.两宋统治者重视发展海外贸易
B.长期战争导致西北陆路贸易通道中断
C.江南地区逐渐成为全国经济重心
D.南方沿海地区造船和贸易发达
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