广安市2017高考英语阅读理解一轮系列训练(4)
阅读理解。阅读下列短文,从每题所给的四个选项(A、B、C和D)中,选出最佳选项。
Recognized as the largest desert in the world, the Sahara runs across North Africa, Covering over 3 million square miles from the Atlantic Coast to the Nile River Valley. Except for an occasional oasis(绿洲), this vast land is mainly made up of sand, stones, and worn out mountains. The burning sun causes daytime temperatures to rise to 70 degrees in the shade, and days without rain commonly last for years.
Paintings found on the walls of caves in the Sahara Desert suggest that a few thousand years ago, large quantities of plants grew there and covered the desert floor. Many curious and unusual insects, birds and animals got enough food that allowed them to grow and reproduce. At that time, huge river systems and many oases supported growing communities(社团,社区) where a large number of people lived.
Research scientists believe that the land became a desert for several reasons. For centuries people there have wandered from place to place in search of food, water and grazing(吃草)land for their animals. These people have always considered the number of animals they have as a sign of wealth. It is considered more important to have 100 sick and starving animals than 15 healthy ones. The large herds (群)have been allowed to go freely and graze on desert plants and grass. Over time, large sections of land have been left uncovered. In addition to allowing overgrazing, these people cut down whatever trees they could find and used them for firewood. The sand was unable to hold on to the great heat of the day, so nightting temperatures often drop below freezing and nothing was left to hold the soil together.
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