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单选题
填空68。DOM is a platform- and language- （66） API that allows programs and scripts to dynamically access and update the content, structure and style of WWW documents (currently, definitions for HTML and XML documents are part of the specification). The document can be further processed and the results of that processing can be incorporated back into the presented （67） . DOM is a （68） -based API to documents, which requires the whole document to be represented in （69） while processing it. A simpler alternative to DOM is the event-based SAX, which can be used to process very large （70） documents that do not fit into the memory available for processing.
A
B
C
D
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答案：
解析：
根据题目描述，DOM是一个与平台和语言无关的API，允许程序和脚本动态地访问和更新WWW文档的内容、结构和样式。DOM是基于树型结构的API，处理文档时需要将整个文档表示为树型结构。因此，正确答案是B，即"tree"。
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