题目

Yesterday, our teacher asked us when a man could be referred as an old man.David stood up and said people with wrinkles could be called old people. However, Mary didn't __21__， for some people may gain wrinkles at an earlier age owing to their __22__ work.Then Lily expressed her idea that those reaching their 60s or more could be called old people.This time, Emily expressed her __23__ that some old people may still be energetic and trying to pursue their dreams, which makes them appear __24__. The class was over and we still didn't reach any __25__， so the teacher asked us to think 一盏“220V，25W”的甲灯和一盏“36V，25W”的乙灯，当它们正常发光时（　） A．甲灯亮 B．乙灯亮 C．两灯一样亮 D．无法判断