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."