怀疑伤寒感染，进行肥达试验，病程中逐周复查，若效价依次递增或恢复期效价增加多少倍始有意义（）

A.≥2

B.≥4

C.≥8

D.≥16

E.≥32

VRML is a (151) 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 (152) (z and time) to the presentation of documents. The applications of VRML are (153) , 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 (154) with VRML. Furthermore, it is componentized, profiled, and extensible, which makes it possible to use X3D in very different (155) , from high-end visualizations to lightweight applications.

A．scenarios

B．places

C．applications

D．programs