题目内容：
秦汉时期，为了防止匈奴的进犯，在一些边关要塞广种（）
A梧桐树
B桑树
C榆树
D漆树
答案解析：
单选题：秦汉时期，为了防止匈奴的进犯，在一些边关要塞广种（）A梧桐树B桑树C榆树D漆树
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