(2012?齐齐哈尔)读中国图,回答下列问题:(1)海:A______海.海峡:B______海峡.(2)岛屿:C______岛,该岛的作物熟制为______.(3)省级行政区:D______(填简称).(4)地形区:E______高原,位于地势第______阶梯上.F______平原.