将4 mol A 气体和2 mol B 气体在2 L的容器中混合并在一定条件下发生如下反应：2A（g）+B（g）
2C（g）若经2 s 后测得C的浓度为0.6 mol/L，现有下列几种说法，其中正确的是（ ）
①用物质A表示的反应的平均速率为0.3 mol/（L·s）
②用物质B表示的反应的平均速率为0.6 mol/（L·s）
③反应达到平衡时，A、B、C的反应速率一定相等
④反应达到平衡时，A、B、C的物质的量均不再变化
A.①③ B.①④ C.②③ D.③④
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