【正确答案】 B

【答案解析】[听力原文]
   In Britain, the Queen will attend a ceremony later today to mark the 800th anniversary of Magna Carta, the document which introduced some of the key rights enjoyed in modern democracies. Here's our royal correspondent Peter Hunt. "In Runnymede meadow on the banks of the Thames, the Queen will mark a pivotal moment in history, the moment when it was established that her ancestors were not above the law the death of despotism—as one historian put it. Magna Carta, Latin for 'Great Charter, ' placed limits on taxation, outlined basic rights including a fair trial. And President Obama has spoken of it as 'the inspiration for America's founding fathers.'" Peter Hunt is reporting there. Magna Carta is also seen as an inspiration for the universal declaration of human rights.
   What is Magna Carta mainly about?