Question 18 is based on the passage you have just heard.

    What makes a perSon famous? This is a mystery that many people have carefully thought about. All kinds of myths surround the lives of well-known people. Most people are familiar with the works of William Shakespeare, one of the greatest English writers of the 16th and 17th centuries. (16) Yet how many know Shakespeare the person, the man behind the works? After centuries of research, scholars are still trying to discover Shakespeare's personal history. It is not easily found in his writings. Authors of the time could not protect their works. An acting company, for example, could change a play if they wanted to. Nowadays, writers have copyrights that protect their work.

    Many myths arose about Shakespeare.Some said he had no formal education. Others believed that he began his career by tending the horses of wealthy men. All of these myths are interesting, but are they true? Probably not. (17) Shakespeare's father was a respected man in Stratford-on-Avon, a member of the town council. He sent young William to grammar school. Most people of Elizabethan times did not continue beyond grammar school; so, Shakespeare did have, at least, an average education. (18) Some parts of Shakespeare's life will always remain unknown. The Great London Fire of 1666 burned many important documents that could have been a source of clues. We will always be left with many questions and few facts.

(18). Why does the speaker say parts of Shakespeare’s life will remain a mystery?

解析：本题为细节题。问题为：讲话者为什么说莎士比亚的部分个人生活会永远成谜？根据原文最后一句Some parts of Shakespeare's life will always remain unknown.可知，莎士比亚的部分生活会一直成为未知。之后交代了莎士比亚部分个人生活成谜的原因。根据The Great London Fire of 1666 burned many important documents that could have been a source of clues.可知，很多重要的文件在一场大火中烧毁了。B选项（可能关于莎士比亚的一些资料被大火烧毁了）与原文信息完全一致。