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【题目】下图为某流域年降水量及水库泥沙沉积厚度示意图,读图回答下列各题。

【1】该流域所属气候类型最可能是( )

A.温带海洋性气候

B.热带沙漠气候

C.温带大陆性气候

D.热带季风气候

【2】导致水库泥沙沉积厚度出现季节差异的主要因素是( )

A.降水量 B.植被覆盖率

C.人口数量 D.地貌形态

【答案】

【1】D

【2】A

【解析】

试题分析:

【1】从图示信息可知,该流域多年年平均降水量约1500mm,冬季水库泥沙沉积厚度相对数低于夏季,说明该流域冬季降水少于夏季。温带海洋性气候全年降水均匀,A错。热带沙漠气候和温带大陆性气候年降水量少,不可能达到1500mm, B、C错。热带季风气候年降水量多,且冬季降水少于夏季,D对。

【2】图示信息反映出水库泥沙沉积厚度夏季大于冬季。结合前面分析,夏季降水量大于冬季,夏季流水侵蚀能力强,携带进入水库的泥沙较多,沉积较厚。冬季降水少,径流量小,携带入水库的泥沙少,沉积相对较浅,A对。植被覆盖率、人口数量、地貌形态有影响,但不是季节变化的主要因素,B、C、D错。

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