题型分类:推论题
原文定位:根据定位词 recent research, the topography, in ancient time 定位到第三句。
选项分析:
该题需要从第三句开始阅读结合排除法选择答案,倒数第三句开始都是讲 floodplain 以前的事情,从倒数第三句话 Floodplain was much lower, the outwash fans (fan-shaped deposits of sediments) of various wadis (stream-beds or channels that carry water only during rainy periods) would have been much more prominent features 和倒数第一句话 The valley may have narrowed at this point to a mere three kilometers 可以看出以前泛滥平原低,降雨少,峡谷窄,与 C 选项一致。
A 选项,与原文相反,floodplains 以前低,现在高。
B 选项,与原文相反,sediment deposits 以前是更明显的特征。
D 选项,与原文相反,以前 floodplains 低,sediment deposits 是更明显的特征,可以推出之前降雨少。
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