[解析]
18.C 19.A 20.B
【原文】
Welcome to our tour agency.Here is some information about the London bus tour.Whether you decide to stay on the open﹣top bus and enjoy the panoramic views of London's most iconic landmarks,or hop off at any of our bus stops across the city,there is much to see and discover.From the famous Parliament Square and Westminster Abbey to Big Ben,the London Eye and many more.Besides,if you don't want to have this guided tour,you can follow any of the routes available.The blue route covers all the main sights in Central London.The red route passes Madame Tussauds and Kings Cross,as well as Hyde Park and Regent's Park,two of the prettiest parks in London.The orange route leads you to London's world﹣famous museums and the beautiful Royal Albert Hall.The yellow route travels from the popular hotels to Harrods and Buckingham Palace.With audio commentary throughout giving you the chance to learn more about the attractions,it's also a perfect way to get to know London,regardless of the time or your budget!