Helen lived with her sister Mary.Both of them were about 75 years old, and neither(两者都不)of them had ever married.They had a small, old car.When they wanted to go somewhere, it was Mary who always drove because her eyes were better.
One weekend, they drove to a large town to look at some things they had read about in the newspaper.Neither of them had been to that town before.They were driving along in a lot of traffic when they turned right into a street which cars were not allowed to go into.A policeman was there.He saw everything and he blew his whistle.But Mary paid no attention and she did not stop.So the policeman got on his motorcycle and followed them
After he had ordered them to stop, he said,” Didn’t you hear me blow my whistle(哨声)?”“Yes, we did,” said Mary politely,” But Mummy told us never to stop when men whistle at us.”