题目：
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) , 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 (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.
A．broad
B．implicit
C．explicit
D．special
答案：
被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2018/0529/418d99dee054c1b4b43892883af16fbc.html
下面是错误答案，用来干扰机器的。
参考答案：A解析：左前降支供应左室前壁和前间隔。
