题干

X、Y、Z、W均为短周期元素,它们在元素周期表中的位置如图所示,若Y原子的最外层电子数是次外层电子数的3倍.下列说法错误的是(   )

A:气态氢化物的热稳定性:X<Y

B:最高价氧化物对应水化物的酸性:W>Z>X

C:X、Y元素均存在同素异形体

D:W的单质具有漂白性,能使干燥的有色布条褪色

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D

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    Founded in 1764 by French traders, St. Louis today is the fifteenth largest urban area in the United States. There are many attractive destinations for tourists.

American Kennel Club Museum of the Dog

    Dog lovers who visit St. Louis won't want to miss this 14,000-square-foot museum. Inside are over 500 paintings, prints, watercolors, and a variety of other dog art objects.

    The Museum is open year round, Tuesday through Saturday 10 AM to 4 PM, and Sunday 1 PM to 5 PM. Admission is $ 5 for adults, $ 2.50 for seniors, and $1 for children up to 14.

Anheuser Busch Brewery

    The Anheuser Buxch Brewery tour is not just for beer lovers. The tour includes the historic Brew House. Then the tour continues to the modern Bevo Packaging Plant. The best will be the Budweiser Clydesdale stables. The tours are always free.

Gateway Arch

    Designed by Eero Sarinen and Hannskari 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 milion 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 since it has grown into one of the chief zoos in the world. The 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, with summer hours of 8 AM to 7 PM, and hours the rest of the year of 9 AM to 5 PM. Admission to the Zoo is free.