B. high walls as a belt to stop the wind

C. long and deep ditch as a belt to stop the wind

D. men stood side by side as a belt to stop the wind

3. The deserts still threaten the world in the way ______

A. of increasing at an unbelievable speed

B. of spreading in Australia , Russia, and the US

C. of appearing new dry and wet areas in every part of the world

D. that they cause the changes of the climates

4. Which of the following do you think is the best method?____

A. People move away from the land that is on the way to become deserts

B. To build great walls to stop the wind and sand

C. To plant trees and grass on the surface of the tree

D. To irrigate the desert

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