【名词&注释】
虚拟社区(virtual community)、管理水平、结节性痒疹(prurigo nodularis)、良性肿瘤(benign tumor)、设计能力(design ability)、高血压性心脏病(hypertensive heart disease)、业务范围(business scope)、继续发展(continue to develop)、明确规定(clearly stipulated)、壮烈牺牲(die hard)
[单选题]VRML is a(1)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(2)(z and time) to the presentation of documents. The applications of VRML are(3),ranging from simple business graphics to entertaining WWW page 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(4)with VRML. Furthermore, it is componentized, profiled, and extensible, which makes it possible to use X3D in very different(5),from high-end visualizations to lightweight applications.
A. A