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附录:听力原文
Desertification happens when land that can be used for farming turns into desert. It affects
around two hundred and fifty million people every year. About a third of all the Earth’s land
suffers from this problem.
Although desertification can happen everywhere, it is an especially big problem in Africa and
parts of South America. It is a problem in China as well. Even people who do not live in desert
areas can be affected, because the sand from the deserts get carried by the wind to other areas. It is
not very healthy to breathe the dusty air. It is worse for the people who live in the desert areas.
They may lose their homes and farms because the land is too dry to use. Many families starve, and
others move to the cities to find work.
There are many reasons why this is happening. Some parts of the world are becoming drier
because of the weather has changed. However, the actions of humans are making the problem of
desertification much worse. People plant too much on the land without giving it a rest; too many
animals depend on the same land for food; and people cut down trees for energy and to make
space for more farms — all of this dries out the land. When it gets too dry and there are no trees to
stop the wind, the soil blows away.
Desertification is everyone’s problem. You can help solve this problem by educating people
in your community and round the world.
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