阅读材料，回答问题：

材料一 在绝对意义上，20世纪发生的集体暴力比过去十个世纪发生的还要多。在1900～1999年之间，世界上爆发了250场国际的和国内的新战争。大约1亿人直接死于由政府支持的、由军事单位组织的集体暴力，故而蒂利称20世纪为“暴力的世纪”，霍布斯鲍姆则将1914～1991年人类的历史称之为“极端的年代”。                 

——摘编自闾小波《从对抗到和解》

材料二 二战结束60年了。虽然这60年中世界并不太平，各种暴力冲突和战争依然在威胁着人类的和平与文明，但大国战争已然远去。……二战的战争规模和破坏能力达到了人类战争史上空前的规模，二战期间人类军事技术的革命性变革，例如核武器的产生和发展，已然揭示了战争前所未有的文明悖论：如果新的世界大战再度爆发，人类将可能无法从战争的摧残中恢复。

——中国日报网《二战启示：世界和平依然任重道远》

    Patricia is a pianist and music teacher in California.She wanted to1money for music scholarships at her local community college.One day she had an idea.She thought，"I'm going to ride my2across the United State this summer.I'm going to ask people to give money3 every mile I ride."She talked to the people in the community about4idea. They all liked the idea and strongly supported her.So she felt very5for it.

    Patricia joined about forty other6who were all from California.They began the long 7 across the US in Astoria，Oregon.Patricia went up and down huge hills.She saw beautiful countryside and8friendly people.9there were problems，too.The 10was sometimes very hot，windy or cold.Patricia was tired and sore every night.

    One day she11an accident.She12her bike and her toes were badly hurt.But she continued to ride.She overcame many difficulties and spent two13on the whole ride.She raised more than $10，000 for music scholarship.Patricia was happy and14of it. She did it!

    People don't 15her when she tells them her age.Patricia looks very young and  acts very young.Can you imagine that she is 67 years old? The 67-year-old woman rode across the US in sixty days !