根据短文内容，从每小题A、B、C三个选项中选出一个最佳答案。
   There are many unusual hotels around the world. In Greenland, there is a hotel made out of ice, open between April and December every year. In Turkey, there is a cave hotel with a television, furniture, and a bathroom in each room. And in Bolivia, there is the Salt Palace Hotel.
Thousands of years ago, the area around the Salt Palace Hotel was a large lake. But over time, all the water disappeared. Today, the area has only two small lakes and two salt deserts.
   The larger of the two deserts, the Uyuni salt desert, is 12,000 square kilometers. During the day, the desert is bright white because of the salt. There are no roads across the Uyuni desert, so local people must show guests the way to the hotel.
   In the early 1990s, a man named Juan Quesada built the hotel. He cut big blocks (块) of salt from the desert and used the blocks to build it. Everything in the hotel is made out of salt: the walls, the roof, the tables, the chairs, the beds, and the hotel's bar.
   The sun heats the walls and roof during the day. At night the desert is very cold, but the rooms stay warm. The hotel has 12 rooms. A single room costs＄40 a night, and a double room costs＄60.
   A sign on the hotel's wall tells guests, “ Please don't lick the walls－it doesn't taste good!”