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问题 单项选择题

当威海市所有物体正午的影子最长时，太阳直射点位于（ ）

A．北回归线

B．赤道

C．南回归线

D．南极圈

答案

参考答案：C

解析：

分析：地球在自转的同时还要绕着太阳转动叫地球公转，地球公转方向与自转方向一样都是自西向东，公转的周期为一年，地球公转产生的现象是季节的变化和太阳高度角的变化．

解答：地球围绕太阳公转时，地轴与公转轨道的平面成66.5°的固定倾角，这就使得一年内太阳光线的直射点有规律地在南北回归线之间移动．当太阳光线直射南回归线时，是北半球的冬至日，北半球的太阳高度角最小，影子最长．威海市位于北半球，当太阳直射南回归线，影子最长．根据题意．

点评：本题主要考查地球公转的概况，理解解答即可．

问答题

请在“答题”菜单下选择相应的命令，完成下面的内容： 注意：下面出现的所有文件都必须保仔在考生文件夹下。 1．给同学王海发邮件，Email地址是：wanghai_1983@sohu.com，主题为：古诗。正文为：“王海，你好，你要的古诗两首在邮件附件中，请查收。”将考生文件夹下文件“。libai1.txt”和“libai2.txt”粘贴至邮件附件中。发送邮件。 2．打开http://www/web/chn.htm页面，浏览对“端午龙舟”栏目的介绍，找到其中的介绍端午的内容，在考生文件夹中新建文件search.txt，复制链接地址到search.txt中，并保存。
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单项选择题

Prior to the UML, there was no clearleading (66) Ianguage. Users had to choose from among many similar modeling languages with minor differences in overall (67) power. Most of the modeling languages shared a set of commonly accepted concepts that are expressed slightly differently in various languages. This lack of (68) discouraged new users from entering the OO market and from doing OO modeling, without greatly expanding the power of modeling. Users longed for the industry to adopt one, or a very few, broadly supported modeling languages suitable for (69) usage.

Some Vendors were discouraged from entering the OO modeling area because of the need to support many similar, but slightly different, modeling languages. In particular, the supply of add-on tools has been depressed because small vendors cannot afford to support many different formats from many differem (70) modeling tools. It is important to the entire OO industry to encourage broadly based tools and vendors, as well as niche products that cater to the needs of specialized groups.

（67）处填（）。

A．control

B．expressive

C．conductive

D．interactive
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