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The size and location of the world’s deserts are always changing. Over millions of years, as climates change and mountains rise, new dry and wet areas appear. But within the last hundred years deserts have been increasing after frightful speed. This is partly because of natural changes, but most responsible for creating deserts are men.

Man can make deserts, but they can also prevent them from getting bigger. Algeria is planning a green belt of trees along the edge of the Sahara Desert to stop the sand. In China, too, windbreaks are being built in the northwest to keep the desert from growing.

But desert still threaten the world. Experts believe that land that is on the way to becoming deserts equals the size of Australia, Russia and US put together. Can we stop the spread of the world’s deserts and save the land that is so essential to mankind? Yes, we can, And we must.

1. The reason for the land that turns into deserts is mostly because of _______

A. the changing of the climates         B. man

C. the natural changes                D. the wind

2. The word “windbreak” means _______

A. trees planted as a belt to stop the wind

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

B

Ellis Island is located in New York Harbor. Ellis Island is open daily year round from 9:30 a.m. to 5 p.m., with extended hours during summer. It is closed on December 25. There is no admission charge to Ellis Island; but donations are gratefully accepted.

At Your Fingertips

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