问题
选择题
All people, they are old or young，rich or poor，have been trying their best to help those in need since the disaster
A even if B whether C no matter D however
答案
B。
考查固定措配whether……or……的用法，句意：自从那次灾难以后，所有的人，不论老人还是年轻人、富人还是穷人，都在努力帮助那些需要帮助的人。