The tours are always free.

　　Gateway Arch

　　Designed by Eero Saarinen and Hannskarl Bandel, it took over two years and 900 tons of stainless steel to build. It is the tallest of the country's national monuments. The arch is part of the Jefferson National Expansion Memorial. About one million people per year come to the top of the arch, where there is an observation platform providing a great view of the city.

　　St. Louis Zoo

　　First version of the St. Louis Zoo opened in 1904 at the St. Louis World's Fair, but in the century it has grown into one of the foremost zoos in the world. The Zooline Railroad, a passenger train takes visitors around the zoo, which contains over 9,000 animals of over 800 species.

　　The zoo is open every day but Christmas and New Year's Day, with summer hours of 8 am to 7 pm, and the rest of the year of 9 am to 5 pm. Admission to the zoo is free.

　　12．If you (a student) plan to visit the American Kennel Club Museum of the Dog with your parents and your five­year­old brother, how much will you pay?

　　A．$8.5.B．$12.

　　C．$13.5.

　　D．$16.

　　解析：选C　数字计算题。根据American Kennel Club Museum of the Dog中的“Admission is $5 for adults, $2.50 for students, and $1 for children up to 10.”可知，$2.50＋$5×2＋$1＝$13.5，故选C项。

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