阅读下列短文，从每题所给的A、B、C和D四个选项中，选出最佳选项。
A
Harry Potter fans, get ready for the journey to Hogwarts and beyond on an official guided tour of Warner Bros. This guided experience at Warner Bros. Studio Tour London—The Making of Harry Potter is the only tour of its kind, so if you're a fan of the magical world, it's a mustdo.
What To Expect
Upon arriving, you will be greeted by an experienced guide who reveals the wonders you'll encounter throughout your tour of the original sets and costumes from all eight of the Harry Potter films. You will be given your own personal headset to ensure you do not miss any of the fascinating behindthescenes facts.
Watch a short film in the cinema before you enter the Great Hall. Visit the original Hogwarts Express locomotive (火车头) and a recreation of Platform 9. Climb aboard the train carriage and pose with a luggage trolley as it disappears through the platform wall.
Once the tour comes to an end, you have the option to reenter the studio at your leisure, find that perfect souvenir at the Studio Shop, or purchase a coffee at the Studio Tour Cafe.
Additional Information
Not wheelchair accessible.
Infants (婴儿) must sit on laps.
Travelers should have a medium physical fitness level.
This tour/activity will have a maximum of 15 travelers.
The total duration of the tour is 5 hours, comprising a 1hour travel time to the studios, a 3hour guided tour, and a 1hour travel time back to London.
Cancellation Policy
If you cancel at least 3 days in advance of the scheduled departure, there is no cancellation fee. If you cancel within 2 days of the scheduled departure, there is a 100 percent cancellation fee.
21．What can be expected throughout the tour?
A．Taking photos with the actors. B．Knowing behindthescenes facts.
C．Creating a new Platform 9. D．Watching Harry Potter series again.
22. Who can join the tour?
A．Couples with little babies. B．Adults with physical disability.
C．A group consisting of 16 members. D．Teenagers with travel sickness.
23．When will cancelling the trip definitely result in financial damage?
A．On the day of registration. B．On the exact day of departure.
C．3 days ahead of the departure date. D．4 days ahead of the departure date.
