单选题 It was a very foggy(多雾的)day in London. Mr. Smith had arrived from Edinburgh to go to a very important meeting, but no buses or taxis were running. He thought he would walk to the office. But he saw that nobody was ever trying to walk anywhere.
While he was standing there, saying unhappy things about the fog, and thinking that he would have to telephone to the office and say that he was not able to come, a young man came up to him and said, "Sir, if you want to go somewhere, I can guide(领路)you. Please trust me. "So Mr. Smith told him where he wanted to go, and they started.
At first, Mr. Smith thought," Perhaps this man is foolish; he would show me a wrong way."
But a minute later, the young man stopped and said, "Here is the place, sir." Mr. Smith was surprised to find that he had already reached the office. He asked, "There is thick fog everywhere, but how can you find the way in the fog?"
"I"m blind, sir, "answered the young man, "but I know London very well, and it is exact- ly the same for me in the fog."