A 根据She needed to start saving for college说明他是通过第一份工作攒钱上大学
B 根据But selling books was one of the most satisfying jobs.说明卖书是最幸福的并且之后也说了他因为帮助了别人而自豪高兴
C 参考B
D 根据Gloria persuaded(说服) her boss to agree to let her do the story.After the story was broadcast,some doctors called,说明他通过做节目使得一些医生给那小孩无偿的帮助
A 整篇文章都讲了他怎样帮助别人,A项体现了整篇文章的主旨~通俗来说就是这个人乐于助人~