听力原文:W: Look, Mr. Harris. This is the Great Pyramid. M: Oh, yes ... it looks very high! W: It's about 137 meters high. M: How long are the sides? W: They're 230 meters. M: It's incredible! Can we go inside? W: I'm sorry, Mr. Harris. it's under repair these days. M: What a pity ! Q6. How long are the sides? (15)