When a disaster occurs, all people, they are old or young, rich or poor, try their best to help those in need.
A. no matter
B. whether
C. however
D. even though
网友回答
A. no matter
(答案→)B. whether
C. however
D. even though
解析：考查连词，根据后面的old or young ，和rich or poor,可知，该空选择whether，
句意为，当一个遭难发生的时候，所有的人，无论年老还是年轻，富有还有贫穷，都会尽全力帮助有需要的人。