题目

读图回答下列问题。  （1）描述图示地区的地形特征。（3分）                                                                                                                                                                                                                                                                                                                                                                                                                                  （2）简述A—B河段的水文特征。（6分）                                                                                                                                                                                                                                                                                                                                                                                                                                   （3）甲地农业生产以小麦种植为主。 评价甲地小麦种植的自然区位条件。（5分）                                                                                                                                                                                                                                                                                                                                                                                                                                  答案：（1）东部以山地高原为主，西部以平原为主（1分）地势东高西低、南高北低（1分）起伏较大（1分）。  （2）径流量较大季节变化大含沙量较小冰期长有凌汛流速慢（各1分）。  （3）利：地形相对较平坦（1分）土壤肥沃（1分）利于种植业发展夏季水热组合较好日照时间较长能满足作物一年一熟的生长需求（1分）河流流经有灌溉水源（1分）。 弊：纬度高易发生低温冻害（1分）。

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