题目:
棕榈科为重要的纤维植物,其纤维主要来自()。
A.叶鞘
B.茎韧皮部
C.果皮
D.树皮
答案:
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Kim Jong-il (16 February 1941- 17 December 2011) was the supreme leader of North Korea from 1994 to 2011. The presenter in North Korean state television announced that h...