What can be known from the text?

参考解析：

细节理解题。根据第二段第一句“Public museums offer free admission in every city throughout England and the UK.”可知，公共博物馆免费，但并不是所有的博物馆，所以A项错误；根据第三段第二句“The Megabus not only runs buses but also provides trains throughout England and is the best choice for cheap travel throughout the country.”可知，最佳方式是乘坐The Megabus，不仅包括公交车，还包括火车，所以B项错误；根据第五段第一句“The taste of the UK card offers up to 50% off at selected restaurant.”可知，指定的餐馆打五折，并不是所有餐馆，所以D项错误；根据最后一段第一句“Many major cities in England offer free walking tours.”可知，C正确。故选C。