试题与答案

可能蒸发量指在下垫面足够湿润条件下,水分保持充分供应的蒸发量。读中国部分区域干燥

题型:选择题

题目:

可能蒸发量指在下垫面足够湿润条件下,水分保持充分供应的蒸发量。读中国部分区域干燥度等值线分布图,回答下列各题:

小题1:根据图中等值线的分布规律推测干燥度是指

A.降水量与实际蒸发量之比

B.实际蒸发量与降水量之比

C.降水量与可能蒸发量之比

D.可能蒸发量与降水量之比小题2:关于该区域干燥度分布及成因的叙述正确的是

A.甲处等值线弯曲的原因是位于山地背风坡

B.乙处比丙处干燥度变化慢

C.本区域干燥度自南向北递增

D.影响该区域干燥度分布最主要因素是海陆位置

答案:

小题1:D  

小题2:D

题目分析:

小题1:读图,根据图中干燥度等值线的变化规律,由东向西数值递增分析,西部内陆降水少,干燥度数值不可能是降水量与蒸发量之比,A、C错。西北地区水分缺少,实际蒸发量比东部要小,所以干燥度数值大不是实际蒸发量与降水量之比,B错。西部地区降水少,晴天多,可能蒸发量大,所以是可能蒸发量与降水量之比,D对。

小题2:读图,根据数值变化规律,甲处干燥度较低,说明是蒸发少或降水较多,背风坡降水少,数值应较大,A错。图中乙处与丙处等值线差值不同,如果等差都是1.0,乙处等值线更密集,乙处比丙处干燥度变化快,B错。本区域干燥度自东向西递增,C错。影响该区域干燥度分布最主要因素是海陆位置,D对。

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