请作答68题，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 AP1 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

table

B

tree

C

control

D

event

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答案：

B

根据题干中的描述，DOM是一个基于平台的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。在处理文档时，它要求整个文档以树形结构表示。因此，正确答案是B，即树（tree）。