请你先算一算，再比一比，为学校拿个主意：到哪个商家购买更便宜？

关于物体的内能，下列说法正确的是：     (       )

完型填空。

    Beijing is a great city. It is the capital1China. It's in the north of China. We can go to Beijing to 2the Great Wall, the Summer Palace and Tian'anmen Square. The zoo in Beijing is very famous. We can see many different kinds of3at the zoo. Most foreign tourists like visiting Beijing. They like the Great Wall, the Summer Palace and Tian'anmen Square. They also like 4food. London and Tokyo are great cities, too. We can see many tall buildings in London. We can see many5in Tokyo.