题目

The Hearst Castle        Hearst Castle is a palatial park on the central California coast and a National Historic Landmark．It was designed by architect Julia Morgan for William Randolph Hearst from 1919 until 1947．In 1957 , the Hearst Coiporation donated the fortune to the state of California．Since that time it has been maintained as a state historic park where the estate and its considerable collection of art and antiques are open for public tours．Despite its location far from any urban center, the site attracts roughly one million visitors per year． Guided Tours        20．甲、乙两数的差是0.4，甲数的$\frac{3}{4}$和乙数的$\frac{5}{6}$相等，甲、乙两数的和是7.6．