A (71) is a data type whose major attributes are determined by the roles governing the insertion and deletion of its elements. The only element that can be deleted or removed is the one that was inserted most (72) . Such a structure is said to have a last-in/first-out (LIFO) behavior, or protocol.

A．quickly

B．recentness

C．recently

D．fast

用化学方程式表示下列化学反应：

（1）磷在氧气中燃烧______；

（2）用氢氧化铝治疗胃酸（含稀盐酸）过多______；

（3）用稀硫酸除去铁锈（Fe₂O₃）______；

（4）实验室用石灰石和稀盐酸制CO₂______．