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A big fire broke out last night. Luckily, the people in the burning house were ____(营救) by the firemen.
下列图形中轴对称图形的个数是( )
一位美国史学家描述道:“……乘船在悲惨的‘中段航程’中横渡大西洋,这些黑色‘货物’上了镣铐,锁在甲板上,没有卫生设备,他们忍受着可怕的待遇……”“黑色‘货物”’将会被贩卖到( )