如图A-7所示，当开关S打开时，（）。A、H1先熄灭；B、H2先熄灭；C、H1熄灭，

下面没有错别字的一项是[ ]

A、明察秋豪　庞然大物        

B、一丝不苟　瘦骨嶙峋

C、盘虬卧龙　小心冀冀        

D、仙露琼桨　忍俊不禁

元素周期律是学习和研究化学的重要工具。下表是元素周期表的部分信息：

认真分析信息，回答：

（1）地壳中含量最多的金属元素的符号是                       ；

（2）表示的是（填名称）                      ；

（3）由1、8、12号元素组成化合物的化学式                       .

（4）上表中每一周期元素原子序数的变化规律是                        。

澳大利亚南部气候温和，降水适宜，适合种植小麦和发展畜牧业。读图回答题。

小题1:图中阴影区的农业地域类型是:

A．商品谷物农业

B．大牧场放牧业

C．水稻种植业

D．现代混合农业小题2:关于图中阴影区农业生产的特点是:

A．单位面积产量高，商品率低

B．与城市市场和工业关系密切

C．大牧场上牧羊与小麦种植混合

D．以自给自足为生产目的

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．inconsistent

B．independent

C．applicable

D．compatible