听力原文：M: Did you hear about the air crash that occurred in South America recently? It was quite a tragic accident! W: No, I didn't see anything in the news about it. What happened? M: A foreign airliner was attempting to land at night in a mountainous area of Argentina and flew into a hill! W: That sounds really terrible! Did anyone survive? M: No, everyone aboard, including the crew, was killed instantly. W: What were the circumstances? Was there had weather, a fire, or engine failure? M: Apparently, there was some low clouds in the area, but mostly it was just miscommunication between the pilots and the air traffic controllers. W: Weren't they both speaking in English, the official international aviation language? M: Yes they were, but the transmission from poor quality radios was slightly distorted and the accents of the Spanish speaking controllers was so strong that the pilots misunderstood a vital instruction. W: How could a misunderstanding like that cause such a serious accident? M: The pilots were told 'descend to 2 -2,000 feet'. The instruction actually meant 22,000 feet, but they thought they heard descend to 2,000 feet. That's a huge difference, and it should have been confirmed, but it was not. Unfortunately, the terrain of the mountains in that region extends up to 20,000 feet. W: So the pilots did descend to the wrong altitude then, thinking they were following the air controllers instructions. M: Sadly enough, yes they did. It was a very bad mistake. Many people died as a result of this simple understanding. W: Wow, that's a powerful lesson in how important it can be to accurately communicate with each other. (20)