閱讀理解。
     根據(jù)短文內(nèi)容,從短文后的選項中選出能填入空白處的最佳選項.選項中有兩項，為多余
選項。
                                                        The War Against Sand
     Imagine living on the edge of a vast desert, which is moving quietly closer to your village every day
and covering your fields. The desert is on the move. This is called desertification.
     Desertification occurs in regions close to an already existing desert.     1     The first is over-use of
water in the area. There is not enough water in any case, and if it is not carefully used, disaster can follow. As time goes on, water shortages make farming more and more difficult. In some places, locals can
remember local lakes and marshes which were once the homes for all kinds of fish and birds.     2    
Farmers leave the land, and fields are replaced by deserts.
     The second cause is misuse or over-use of the land.     3     Ploughing(耕) large fields and removing
bushes and trees means that the wind will blow away the soil. Once the soil is lost, it is hard to replace,
and if there is rain, it has nowhere to go, and brings no benefit.
         4     Every spring, the skies over some of eastern cities, thousands of kilometers away from the
deserts, can be darkened by sandstorms. Dust from deserts can have a great effect on weather systems. While desertification is perhaps being partly caused by global warming, these sandstorms can make
global warming worse by adding to what is known as the greenhouse effect.
     What can be done to slow down or stop the process of desertification? A great deal of work is
already under way. Obviously first steps are to find new water sources.     5     Some types of grass also
hold the soil together, and stop the wind taking it. Without these efforts, it will be harder and harder to
stop the world's deserts in their tracks, and more and more farmers will give up and head for cities. The
lesson to be learnt lies beneath the sand.
A. It generally arises from two related causes.
B. It is not only the farmers and villagers who suffer.
C. They have been completely buried by the sand now.
D. Scientists are doing the research on the cause of desertification.
E. They destroy the land, as the soil dries out and is then blown away.
F. Tree planting can help, by providing barriers between desert and rich field.
G. This means that the wrong crops are planted, and need more water than is available.
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