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
网友回答
A. even if
(答案→)B. whether
C. no matter
D. however
解析：本题考查固定词组搭配。whether…or…表示“无论……还是……”