[题目]有效灌溉面积是指灌溉工程能够进行正常灌溉的水田和旱地面积之和.有效灌溉面积比例是指有效灌溉的耕地面积占耕地总面积的比重.它是反映农田水利建设的重要指标.下表为我国四个省区(海南.浙江.黑龙江.新疆)2013年的相关数据.据此完成下列各题.省区耕地总面积/万公顷有效灌溉面积比例/%甲52191．5乙23161丙8531丁1 22044 题目和参考答案——青夏教育精英家教网—

题目内容

【题目】有效灌溉面积是指灌溉工程能够进行正常灌溉的水田和旱地面积之和。有效灌溉面积比例是指有效灌溉的耕地面积占耕地总面积的比重，它是反映农田水利建设的重要指标。下表为我国四个省区（海南、浙江、黑龙江、新疆）2013年的相关数据，据此完成下列各题。

省区	耕地总面积/万公顷	有效灌溉面积比例/%
甲	521	91．5
乙	231	61
丙	85	31
丁	1 220	44

【1】四省区有效灌溉面积比例有明显差异的主要原因是（）

①地形类型的差异 ②经济发展水平的差异 ③劳动力数量的差异 ④降水的差异

A．①② B．②③ C．②④ D．③④

【1】表中甲、丙两省区最主要的经济作物分别是（）

A．花生、甜菜 B．棉花、天然橡胶 C．油橄榄、春小麦 D．油菜、黄麻

【答案】

【1】C

【2】B

【解析】

试题分析:

【1】根据材料，有效灌溉面积比例是指有效灌溉的耕地面积占耕地总面积的比重，经济发展水平差异影响农田水利建设，②对；降水多的地区不需要灌溉，降水少的地区灌溉是农业发展的主要水源补给。所以降水量差异影响灌溉面积比例，④对。耕地主要分布在平原地区，地形类型、劳动力数量可能影响耕地总面积，不是影响有效灌溉面积比例的主要原因，①③错，故答案选C项。

【2】根据表中数值，耕地总面积最大的丁是黑龙江，灌溉面积比例最大的甲是新疆，比例最小的丙是海南，乙是浙江。甲最主要经济作物是棉花，丙最主要的经济作物是天然橡胶，答案选B项。

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