Have you ever complained why life is so tiring? Does the sky sometimes seem dark to you? Are your studies sometimes not successful? Well, friends, cheer up and smile all the time. If you see the world with your warm heart, you will find the whole world smiles to you.

    While in school, sometimes you are tired of your lessons, but have you ever noticed the happy smile on your teacher's face when you did a good job?

    One day it is fine. Just before you want to go out, it suddenly starts to rain. Maybe you would feel very sad and start complaining about the weather. But dear friends, why don't you sit down and listen to the concert that the nature offers you? And with the timely rain, crops in the fields will grow better and better and farmers will have a good harvest.

    Although everyone wants to succeed in what he tries to do, sometimes failure can't be avoided. I think failure is not terrible, and the terrible thing is what we are afraid of it and give up hope. When we face failure, we must be confident in ourselves, draw a useful lesson from it and try our best to finish what we have decided to do. As a popular saying goes, "Failure is the mother of success."

    Attitude decided everything. With an optimistic(乐观) attitude life is easy and pleasant. Let's smile whatever we meet and the whole world will smile to us.

阅读下列材料，回答问题。

材料一　第二次世界大战中，特别是太平洋战争爆发后，中国的战略地位开始逐渐受到美国决策者的重视。珍珠港事件爆发后，中国的抗日与美国的切身利益紧密联系在一起。美国在大规模援华的同时，从长远利益出发，确定了战后对华政策的长远目标，即建立一个相对稳定而亲美的中国以发挥多种作用，中国成为美国在亚洲的主要据点，抵制苏联的影响，为美国提供巨大的市场和原料基地，在国际事务中提供坚定支持美国的一票。

——刘德斌主编《国际关系史》

材料二　……中国战场在世界反法西斯战争中所显示出来的重要军事价值，促成了中国国际地位的改善和提高。抗战时期，中国的国际地位可说经历了一个不断提升的三级跳。……在旧的国际体系解体之后，中国积极参与了新的国际体系的创造，并由此而在国际事务中担当重要角色。

——王建朗《抗日战争与中国国际地位的变迁》