Allen had to call a taxi because the box was ____ to carry all the way home.

A．much too heavy

B．too much heavy

C．heavy too much

D．too heavy much

在建筑工业上常用石灰石煅烧得到生石灰，生石灰与水反应生成氢氧化钙后再粉刷到墙上，过一段时间后，发现墙壁会“出汗”．请写出发生反应的化学方程式：______．