Question

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

Answer 1

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。