精选优质文档-倾情为你奉上人事部三级笔译（CATTI）2008.11完形填空原文One of Natures most fascinating mysteries is how s find their way home over vast distances.No matter how far away they are taken, they almost always return to their lofts.Now German scientists believe they have discovered how the birds do it. Research has revealed that tiny iron structures in their beaks allow them to analyse the earths magnetic field - much like a compass.Through the signals picked up, the birds can work out where they are
