The most famous statue-the Sphinx in Egypt has been damaged. The experts are trying to find out the cause to protect it. As we all know, the Sphinx has the body of a lion and the face of a man. It was cut from limestone  near Egypt's pyramids about 4, 500 years ago. Not long ago a large piece of stone fell from the Sphinx's right shoulder. In order to protect the statue from more harm, a computer was placed on it to measure rainfall, wind speed and air temperature. The computer also measured the amount of water and air pollution, the direction of wind and the temperature of the statue itself. The effects of age, wind, water and pollution have greatly weakened the Sphinx. Sunlight, wind, water and pollution have been eroding the outside of the statue for centuries. The experts hope that the information from the computer will help protect it from more damage. They say the more they know about what is destroying the Sphinx, the more they can do to protect it. What does this passage mainly tell us?
The reason why the Sphinx was set up. The great importance of the Sphinx in Egyptian history. The detailed  course and cause of the damage to the Sphinx. The experts are trying to find out the cause so as to protect the Sphinx.