In some parts of the world there are large deserts (沙漠). There are no trees (41) water there. Travellers must take (42) .and water with them. The only animal who can walk (43) the desert is the camel (骆驼). He can go (44) food and water for a long time, and can carry heavy things. People call the (45) "the ship of the desert,"
The camel is very big. He has one or two humps (驼峰) on his back, short ears and a long (46) .
The camel’s humps hold fat (脂肪), and his stomach (胃) holds water in twelve deep pockets. Each pocket (小袋,袖珍的) (47) a mouth. When the camel (48) some water, he can get it out of the (49) . The camel’s food is (50) .