What do we learn about deserts from this text？A．Deserts can change into green and fertile
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What do we learn about deserts from this text？
A．Deserts can change into green and fertile areas.
B．Certain areas have always been desert.
C．Deserts were once the home of elephants and giraffes.
D．Deserts have been growing since the beginning of the world.
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正确答案：A
解析：文章第二段第六行“Throughout history deserts have been expanding and retreating again．”这段中谈到，一些肥沃的地方以前曾经是沙漠，而现在的沙漠以前也曾经是沃土和绿洲。所以A符合文章的内容。