D　[主旨大意题。根据倒数第三段可知，所有人都被老人简单的举动打动了，可知D项(一个小小的积极的行动会产生大的意义)正确。]

　　B

　　Volunteers abroad always return home feeling like they made a really worthy contribution to the area they visit. It's quite right because any volunteer organization will put your skills to work in the most valuable way possible. Volunteer teaching in Africa is one of the areas where help is always wanted. Even if you don't have teaching qualifications (资格) right now, it doesn't mean you won't be welcome.

　　Many volunteer teaching assistants are people in the early years of their studies. Others have no long­term teaching plans but a willingness to take on new challenges and help wherever they can. It's not just classroom work either. For example, recent storms in Livingstone in Zambia took the roof off the local school. Volunteer teaching assistants rolled up their sleeves and helped put it back on again.

　　Teaching in Africa is more than sitting in classrooms with young children. If sports education is your thing, there are opportunities for you to help teach your skills with notable programs in Zanzibar, Mozambique, South Africa and Zambia. In these same areas there is equal need for education of adults, not just for their personal development but also in many other ways.

　　If you think it's all work and no play, there will be plenty of time for you to have your own adventures in this beautiful country. There's white­water rafting on the Zambezi, surfing off the East African coast. If peaceful and quiet life interests you, there are famous South African vineyards (葡萄园) and the top restaurants of the Cape Town.

　　Whatever your skill is, volunteer organizations will find a place for you where you can make the most difference. Whatever you give volunteer teaching in Africa for a couple of weeks or a couple of months，you will have great influence on the people you meet.You really can help change people's lives.

　　【语篇解读】　你想到非洲志愿支教吗？欢迎你来非洲支教，总有一份工作适合你。

5．If a college student volunteers to teach in Africa， ．