For hundreds of years, the Sphinx attracted people both as a religious monument and as a work of art. But eventually, the desert sand once again covered the Sphinx, leaving only the head visible. It was not until the 1800s that archaeologists (考古学家) began clearing the sand from the statue and began researching the long history of the Sphinx. At last, in the 1920s, all of the sand was finally cleared away and restoration work, which continues to this day, was begun.The name “sphinx” comes from an ancient Greek word. According to Greek legend, the Sphinx was an evil creature with the body of a lion and the head of a woman. She sat beside a road and asked all the people who passed her a riddle (谜语): “Which animal in the morning goes on four feet, at noon on two, and on three in the evening?” She killed anyone who couldn’t make sense of the question. The riddle was finally solved by the Greek king. The Sphinx then threw herself from her high rock and died.What is the main focus of the passage?A. The restoration of the Great Sphinx.B. The history of Egyptian tourism.C. The history of the Great Sphinx.D. The great monuments of Egypt.