Fridays and Saturdays, April 24—May 16, 2017.

　　May 17—September 7, 2017.

　　VISITING TIPS:

　　Limit the Number of Bags: All visitors are screened through metal detectors upon entry. The fewer items you bring inside the Museum, the faster your entry. Before you visit, please review the list of prohibited items, which include pocket knives and tripods (三脚架). Visitors carrying prohibited items will not be allowed inside the Museum, so please leave them at home or in your car.

　　No Food and Drink: Only bottled water is permitted in the Museum. You may only consume food and other drinks in the Food Court, not in the Museum. Groups who bring food are encouraged to picnic on the National Mall.

　　Please Take Photos: You are welcome to take photos for personal use. However, tripods and monopods (单脚架) are not permitted without approval.

　　First Aid: The Museum has a First Aid office and a nurse on duty. Please contact the nearest security officer or the Welcome Center for assistance.

　　Visit the Welcome Center:

　　At our Welcome Center in the South Lobby, staff and volunteers can answer any questions you have during your visit.

　　Open 10: 00 am to 5: 30 pm

　　Phone: 202-633-2214

　　E-mail: NASM-VisitorServices@ si. edu

　　21. According to the passage, the National Air and Space Museum is a museum _______.

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