人类很早就知道城墙的防御效果，古往今来，不知上演过多少隔墙而战的攻防战役。蒙古人开始征战世界时，善于野战的游牧骑兵团对攻城战束手无策。但蒙古人善于学习，很快就掌握了攻城的战术，并将各地的攻城武器集中起来综合使用，达到了很好的效果，许多固若金汤的城池都被摧毁了。欧洲当时那些较薄的城墙，根本不能抵御蒙古人的攻击，特别是蒙古人开始使用多种威力巨大的火器，更具破坏性。从此以后，由于火炮的火力改进，城墙的作用就逐渐从人类历史中消失了。 这段文字意在说明：
A.蒙古兵团是怎样征服欧洲的
B.城墙是如何退出历史舞台的
C.火器是如何在攻城战中发挥作用的
D.蒙古的游牧兵团是如何调整战术的
参考答案：B
解析：
解析 文段先介绍了城墙在古代的防御作用，但在蒙古人掌握攻城的战术后，让许多固若金汤的城墙被摧毁，从此之后渐渐退出了历史舞台。故文段主要介绍城墙如何退出历史舞台。B项表述与此一致，当选。 考点：阅读理解 考点介绍：言语理解与表达>阅读理解
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| The old Olympic Games began around the year 776 BC in Creece. Many of the sports 1 the same as they are now. But then women were not 2 to take part in the games. The first Olympic Cames 3 modern times happened in 1896. They were 4 in Greece, where the games were born. Both the Summer and Winter Olympics are held 5 four years. The Winter Olympics are usually held two years 6 the Summer Olympics. The 24th Summer Olympics were held in 1984in Los Angeles (洛杉矶).The competitors from he People's Republic of China 7 the games for the first time. The Chinese competitors 8 many medals since then. 9 most of the medals were won by women. We hope men will 10 their best to wm more medals.
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