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【简答题】
如图是根尖的立体和平面结构图，识图并填写有关根尖结构和功能的内容。 （1）植物的根能不断地在土壤中延伸的原因是［ ］___________使细胞数目增多和［ ］___________使细胞的体积增大的缘故。 （2）根吸收水分和无机盐的主要部位是［ ］___________，与该功能相适应的结构特点是______________________。 （3）在根尖的各部分结构中，伸长最快的是［ ］___________。
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A.
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B.
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C.
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D.
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the, a
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a, the
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