阅读下列材料:

材料一 1988年8月8日晚上8时15分,联合国秘书长宣布:“两伊将于1988年8月20日格林尼治时间3时正式停火。”这一消息传到伊拉克首都巴格达时,人们涌上街头,互相拥抱,欢呼雀跃;当消息传到伊朗首都德黑兰时,也出现了同样的场面,人们激动地说:“停火太好了!太好了!”8月20日,燃烧了8年之久的两伊战争之火终于熄灭。

材料二 我记得那是1984年2月27日的早上,在我们听见一阵战机轰隆飞过上空,不久后,我们手上的枪与其他武器的表面就沾上了一层黑色物质。然后,我就感觉身体火烫,鼻孔很疼痒。接着……不……是马上感觉呼吸困难,像是窒息一样。6个小时后,眼睛发炎、视力减退,身体的许多部分更是疼痛不已。

——一位遭到化学武器袭击的伊朗士兵的回忆

材料三

请回答:

杂技演员在表演走钢丝时，保持身体平衡主要是依靠下列哪一部分（　　）

下棋“落棋不悔”、足球“越位犯规”、车辆通行遵守“红灯停、绿灯行”等，这些都是我们应该遵循的（   ）

    Thang-ga(唐卡）is a special kind of painting .It was found only in Tibet,China. It started from the Tang Dynasty(唐朝). Thang-ga paintings show Tibetan people's lives. In recent years, Tang-ga paintings have caught the public's attention .At the same time,the Chinese government has also tried hard to protect the art.

    The color of Tang-ga paintings looks wonderful and special. Because of the special environment of Tibet and the excellent skills of artists, the paints(颜料) used in Thang-ga are different from other paints. They were made from minerals like gold and silver, as well as some plants. The paints were made by hand and the beautiful colors could last(持续)for hundreds of years.

    However, with the development of technology, people now use cheaper and more easily-made chemicals to make Thang-ga paints. The traditional paints used in Thang-ga paintings took a lot of work and they were made in many secret ways. Later people stopped making the paints and forgot about them. So the skills needed to make them were almost lost. The traditional Thang-ga paintings are difficult to find now.