学进去

You may think there is only sand in the desert of the world, but it is not true. In the desert, as we know, there is a little ____ and it is not ____ for most plants. Still we can see some plants live in the desert.

There is ____ in some places in the deserts. We ____ these places oases(绿洲). In the oases, there are villages and towns. People grow ____ kinds of vegetables and rice in the fields there. People ____ live outside the oases. They have camels, sheep and other animals. These animals live ____ the desert plants for their food and do not need any water. The ____ are useful to the desert people in many ways. They eat the ____ and drink the milk of the animals. They ____ the camels for carrying water, food, and ____ .

The people of the desert have to keep ____ from place to place. They must always look ____ grass or desert plants for their animals. When there ____ no more food for their animals, they move to another place. The desert people are ____ Every one in the desert likes to help the people in trouble and give them food and water.