Do you know that in some parts of the world, people build temporary hotels made of snow and blocks of ice? These are known as ice hotels. Unlike usual hotels, all the rooms in the ice hotels are made of ice. In some ice hotels, even the glasses for drinks are made of ice blocks. So they only serve cold drinks. Also, hot food is not served in the ice hotels, but guests can eat hot food at places nearby. To keep warm, guests sleep in comfortable sleeping bags on ice blocks that are covered by mattresses and reindeer skins . There are some places in the ice hotels that are heated, such as the bathrooms. This is because, even though it is not as cold in the ice hotels as it is outdoors , indoor temperatures are still very low. Perhaps the most interesting thing about the ice hotels is that they are rebuilt every year. They can be used only during the winter months. The ice hotels melt away when spring arrives. The ice blocks used to build these hotels are from nearby rivers. So, when the ice hotels melt away, they melt back into the rivers. Which of the following about the ice hotels is true?
They are just like usual hotels. The glasses are made of wood. They serve cold drinks. The rooms are made of bamboo.