——Mum, the train is leaving in eight minutes. I go now.——Okay, Jim, call me when you get there.
— OK, ________. Here is a room for you.
以下为我国经济发展中“单位GDP能耗”年度变化示意图。(GDP:国内生产总值。单位:吨标准煤/万元)图中“单位GDP能耗”出现最高峰值的直接原因是( )