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
Magical History Tour
Join us for our fifth annual exploration of fascinating historic sites around Greater Portland that you've never seen or maybe didn't even know existed! The Magical History Tour is your key to unlocking fascinating historical places that are not usually open to the public. It is a self-guided adventure which is guaranteed to amaze and amuse both adults and children. Equipped with a map, and at your own pace, you will be greeted by guides at each location ready to share the history of the tour stop.
In the 5th year of the Magical History Tour, we will be presenting an exciting mix of both new sites and favorites from the past four years.
The Magical History Tour check-in begins at 9:45 am at Maine Historical Society's Brown Library.At this time,you will find out where the tour will take you to as you receive your map and ticket into each site.
Follow us on Twitter and Instagram for updates, chances to win tickets and some other exciting opportunities; and feel free to share your tour experiences to our social media pages using MHS tour!
·Time: 10:00 am-4:00 pm,Saturday,May 11,2019
·Location:485 Congress Street
·Tickets: Get your tickets online, by calling us at (207)774 - 1822, or by visiting our Museum Store at 489 Congress Street. $25/Adult MHS Member; $35/Adult General Admission; $5/Junior under age 18.
·Volunteering:We need volunteers for the Magical History Tour!Volunteers help for half the day of the tour and are given a free ticket to the tour to enjoy either before or after their volunteer shift!
For more information, email us at events@mainehistory. org or call us at(207)774-1822.
21. What's the purpose of the Magical History Tour?
A.To explore unfamiliar historic sites.
B. To visit some world-famous attractions.
C. To provide children with history classes.
D. To make some private places known to the public.
22. How much should a couple (one is the MHS Member) and a kid pay?
A.$55. B.$65. C.$75. D.$105.
23. What can we learn from the text?
A. You can buy a ticket by email.
B. Tourists will only be guided by a map.
C. Only new sites are available for the tour.
D. Volunteers can take part in the tour for free.
