题目内容：
回答题：VRML is a __（71）__ for 3D multimedia and shared virtual worlds on the WWW. In comparison to HTML, VRML adds the next level of interaction, structured graphics, and extra __（72）__ （z and time） to the presentation of documents. The applications of VRML are__（73）__,rangingfromsimplebusinessgraphicstoentertainingWWWpage graphics, manufacturing, scientific, entertainment, and educational applications, and 3D shared virtual worlds and communities. X3D is the name under which the development of VRML is continued. X3D is based on XML and is backwards __（74）__ with VRML. Furthermore, it is componentized, profiled, and extensible, which makes it possible to use X3D in very different __（75）__, from high-end visualizations to lightweight applications.（71） A．link
B．format
C．structure
D．procedure
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