阅读下面材料,从每题所给的A、B、C、D四个选项中选出最佳选项。
Dear Edward,
How are you doing? I just visited Machu Picchu in Peru today. I've never seen such a great place before. This place is so amazing that I want to share my feelings with you.
When I first got to Machu Picchu, I felt like I was walking in the sky. Even the clouds were just under my feet. Do you know how high Machu Picchu is? I was surprised that it was at about 2,500m. How could people build a city on such a high mountain? It must have been very difficult to move stones there.
Before the Europeans arrived, the Incas (印加人) were the last and the most modern society in the Andes (安第斯山). The Incas were afraid that the Spanish would find them, so they built Machu Picchu on an Andes plain (平地) as a secret city in the 14th or 15th century. As a result, the Spanish never found Machu Picchu.
An American explorer discovered Machu Picchu in 1911. For a long time before that, nobody even knew Machu Picchu was there. After Machu Picchu was found, it was called "The Lost City of the Incas". It is still a mystery why and how Machu Picchu was left and forgotten by everyone.
I just had a wonderful day. Especially, I will never forget the "goodbye boy" who was a local boy dressed in traditional Inca clothes. When we went down the mountain by bus, the boy waved goodbye to us until we were out of sight (视线). He shouted some words at us too, and I guess, it meant, "Goodbye, come back again soon!" Why don't you visit Machu Picchu someday? I am sure you will love this place as much as I do.
Yours truly,
Lynn