听力原文： This area is for authorized personnel only. You must have a special pass to enter the area. Passes may be obtained at the Security Office upon presentation of a valid driver's license. You must keep your pass with you at all times during your visit and be prepared to present it to a uniformed security officer upon request. It should be hung around your neck or pinned to the front of your clothing in order to keep it plainly visible. In addition, you must obey the safety rules posted on signs throughout the area, and stay away from restricted areas. Return your pass to Room 3 before exiting the area. A new pass will be issued each time you wish to enter this area. What is needed to enter?