DOM is a platform-and language-（1）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　incoporporated back into the presented （2）.DOM is a （3）-based API to　documents ,which requires the whole document to be represented in （4）while　processing it .A simpler alternative to DOM is the event –based SAX,which can be　used to process very large（5）documents that do not fit info the memory　available for processing.
（1）A、specific
B、neutral
C、contained
D、related
（2）A、text
B、image
C、page
D、graphic
（3）A、table
B、tree
C、control
D、event
（4）A、document
B、processor
C、disc
D、memory
（5）A、XML
B、HTML
C、script
D、web