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( )In a tree diagram of sentence structures, S is the root of the tree, occupying the topmost position, from where it branches into phrasal categories, which further branch into smaller syntactic units. The points at which the tree branches are located at various levels are known as branching nodes. A branching node is connected directly only to one lower node.

试题出自试卷《现代语言学2011年10月真题试题与答案解析(00830)》
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