阅读下列短文，从每题所给的A、B、C、D四个选项中选出最佳选项。
A
Unusual Libraries Around the World
There are 2.7 million libraries spreading across the globe, and while there are many beautiful ones, there are also a number of unique ones.
Haskell Free Library and Opera House, Quebec, Canada and Vermont, US
The Haskell Free Library and Opera House, a special library spanning two countries, is stationed on the border between Canada and the United States and serves people from both countries. The main entrance is on the American side, but the majority of collection of the books are in Canada. There's even an official American-Canada borderline running right across the library's floor.
Deichman Bjørvika, Oslo, Norway
Praised by many as a library of the future, the Deichman Bjørvika, city of Oslo’s new main library, has one hundred unread and unpublished texts. They are stored in a specially designed room lined with wood from the forest, making the library the world's most secretive one. It witnesses different authors add their works to the collection that will not be available for reading until 2114.
Seashore Library, Qinhuangdao, China
Quietly sitting on an isolated(孤零零的)stretch of beach of Qinhuangdao in northern China, the Seashore Library has been called the world's loneliest library. People have to walk across the sand to reach the doors. The building is designed to promote people's connection with ocean, so the main reading room features a layered design to ensure that everyone has a good view of the sea.
Bibliotheca Alexandrina, Alexandria, Egypt
Bíbliotheca Alexandrina is considered as a revival(复兴)of an ancient library in the Alex-andria 2,300 years ago or so. Characterized by its circular, tilting form, the building spans 160 meters in diameter(直径)and reaches up to 32 meters in height, while also diving some 12 meters into the ground.
21. What highlights the Haskell Free Library and Opera House?
A. It crosses two countries.
B. It is accessible only by boat.
C. It has the largest collection of books.
D. It is modeled after an ancient library.
22. Why is the Seashore Library built in Qinhuangdao?
A. To promote the stretching beach.
B. To help visitors get rid of loneliness.
C. To involve visitors in the natural world.
D. To make it the world's loneliest library.
23. Which library is unavailable to readers at present?
A. Haskell Free Library and Opera House.
B. Deichman Bjørvika.
C. Seashore Library.
D. Bibliotheca Alexandrina.
