阅读下面材料回答问题。
材料一:已“销声匿迹几个月”的索马里海盗于2009年10月19日在印度洋上劫持了中国货轮“德新海”
              号,引起国际社会的关注。
材料二:索马里半岛及附近地区略图。

材料三:2009年前三个季度我国主要贸易伙伴进出口总值表。

材料四:
(1)请分析甲图中A海域的形成原因。
                                                                                                                                                                
(2)描述甲图中B处7月份的洋流流向,说明其成因,并分析此时洋流的冷暖性质。
                                                                                                                                                                
                                                                                                                                                                
                                                                                                                                                                
(3)据材料三结合我国能源状况,分析我国派军舰护航,打击索马里海盗的必要性。
                                                                                                                                                                 
                                                                                                                                                                 
                                                                                                                                                                 
(4)索马里所在区域经济落后,自1991年以来一直战乱不断,沿海地区海盗活动猖獗,被国际海事局列为世界上最危险的海域之一。结合材料四,分析索马里所在区域经济落后的原因。
                                                                                                                                                                  
                                                                                                                                                                  
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