单选题 The steadily rising cost of labor on the waterfront has greatly increased the cost of shipping cargo by water.
【正确答案】 A
【答案解析】[解析] 题干大意：滨海区劳动力价格的持续上涨已经大大增加了货物运输成本。画线词steadily：稳固的，持续的，选项中gradually：持续的，故答案选A。