A Pledge http://www.xue90.cn来自《幽默学英语》网
Grandpa was celebrating his 100th birthday, and everyone was complimenting him on how well he looked.
"I'll tell you the secret," he said. "My wife and I were married seventy-five years ago. On our wedding night we made a pledge that whenever we had a flight, the one who proved wrong would go out and take a walk. I have been in the open air continuously for the past seventy-five years."