几乎快空心的柳树，树叶依旧繁茂，为了揭开树木不怕空心的原因？

第一步：查资料：植物体内有两种运输线，植物生活所需要的全部物质就靠这两种运输线来输送，一种是木质部里的运输线，另一种是韧皮部里面的运输线．它们分别运输水分和有机物等。

第二步：欲证明水分和无机盐是通过哪种运输线运输，设计了如下实验：

剪取生命活动旺盛的一根柳树（或月季）枝条，将柳树枝条基部纵剖，如图，下部处理成只有木质部（左）或只有韧皮部（右），分别插入两只烧杯的溶液中，烧杯中盛有红色土壤浸出液（红色物质对柳枝无害）．

写出下列各组分式的最简公分母：

许多学者认为，秦朝的建立标志着官僚政治取代过去的贵族政治，根据所学知识判断，“官僚政治”的最基本特点应该是（  ）

增加：在缺词处加一个漏字符号（∧），并在其下面写出该加的词。

删除：把多余的词用斜线（﹨）划掉。

修改：在错的词下划一横线，并在该词下面写出修改后的词。

注意：1.每处错误及其修改均仅限一词；2.只允许修改10处，多者（从第11处起）不计分。

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