Mr. Black was old, but able to quickly to changes in technology.
A. reply
B. apply
C. contribute
D. respond
网友回答
A. reply
B. apply
C. contribute
(答案→)D. respond
解析：考查词义辨析。reply 回答，apply 申请，contribute 贡献，respond 反映，句意：布莱克先生年纪大了，但是能够对技术上的变化做出快速的反映。所以选D。