阅读理解，根据短文内容， 判断下列句子正误、选择正确答案。

In some parts of the world there are large deserts(沙漠). There are no trees or water there. Travelers must take food and water with them.

The only animal who can walk across the desert is the camel. It can go without food or water for a long time, and it can carry heavy loads(担子) . People call the camel "The ship of the desert".

The camel is very big. It has one or two humps (驼峰) on the back, short cars and a long neck. The camel's humps hold fat. And its stomach holds water in twelve deep pockets. Each pocket has a mouth which closes itself and the food does not mix with the water .When the camel wants some water, he can get it out of the pockets. The camel's food is grass and leaves of trees.