题型分类：否定事实信息题
原文定位：整个段落都在讨论 raising cattle in Africa was demanding，可直接通过选项定位。
选项分析：
D 选项与倒数第二句 small cattle herds spread south rapidly in areas where they could be grazed 矛盾。
A 选项出自于第二句 They required water at least every 24 hours and large tracts of grazing grass if herds of any size were to be maintained。
B 选项出自于第二句 They required water at least every 24 hours and large tracts of grazing grass if herds of any size were to be maintained。
C 选项出自于 Even modest cattle herds required plenty of land and considerable mobility. To acquire such land often required moving herds considerable distances, even from summer to winter pastures。（即使是适量的牛群也需要大量的土地和相当的流动性。为了获得这样的土地，通常需要将牛群移动相当远的距离，甚至从夏季牧场到冬季牧场。）这说明牛群需要相当的流动性，并且为了获得足够的土地，通常需要将牛群移动相当远的距离，甚至在不同季节之间（从夏季牧场到冬季牧场）进行移动。这与选项 C 的意思是一致的。