阅读下列短文，从每题所给的A、B、C、D四个选项中选出最佳选项。
A
If volunteering begins at an early age, it can become part of a child’s life—something he or she may just expect and want to do. It can teach them：
A sense of responsibility (责任感). By volunteering, children and teens learn how to be on time for a job，do their best, and be proud of the results. And they also learn that, in the end, they are responsible for the wellbeing (幸福) of the whole community (社会).
The knowledge that one person can make a difference. A wonderful message for a child is that he or she is important enough to have an effect on someone or something else.
The benefit of sacrifice (牺牲). By giving up a toy to a less fortunate child, a child learns that it’s good to sacrifice sometimes. Cutting back on playing time to help clean up a street tells kids that there are important things other than themselves and their needs.
Tolerance. Working in community service can bring kids and teens in touch with people of different backgrounds, abilities, ages, and education. They will likely find that even the most diverse people can be united by common values.
Job skills. Community service can help young people decide on their future careers. Learning to work as a team member, taking on leadership roles, setting project goals—these are all skills that can be learned by volunteering and will serve a child well in any future career.
How to fill free time wisely. If a child isn’t interested in traditional after-school activities, community service can be a wonderful choice.
文章大意：本文是一篇说明文。介绍了志愿活动教给孩子的东西。
21．You help a student who can’t go to school because of money. That is about __C__ .
A．a sense of responsibility B．job skills
C．the benefit of sacrifice D．tolerance
解析：细节理解题。根据第四段可知，将玩具给比自己不幸的人能让孩子了解有时牺牲个人利益是有好处的，削减玩耍时间帮忙打扫街道能让孩子懂得有些事比自己和自己的需求更重要，这都反映了牺牲个人利益去帮助他人的好处。帮助因贫困不能上学的学生属于此类。故选C项。
22．If you have to get on with all kinds of classmates—hard-working or lazy, workaholic or play-first, polite or rude, etc, what you need most is __D__ .
A．a sense of responsibility
B．the knowledge that one person can make a difference
C．the benefit of sacrifice
D．tolerance
解析：细节理解题。根据第五段内容可知，想要与性格各异的同学相处，最需要的是容忍。故选D项。
23．What would be the best title for this passage？ __B__
A．What to Do as a Volunteer
B．What You Can Learn from Volunteering
C．How to Be a Good Volunteer
D．Learn to Be a Volunteer
解析：标题判断题。全文列举了做志愿能学到的东西，如：责任感、自己的帮助能对其他人或事产生影响、牺牲的好处、容忍、工作技能和如何充分利用空闲时间。故选B项。
