X、Y、Z和W代表原子序数依次增大的4种短周期元素。X元素原子最外层电子数比次外层电子数多2；Z与Y相邻，Z比Y的电子数多8；W元素原子最外层电子数等于电子层数的2倍。下列说法正确的是

A．W元素的氧化物对应的水化物一定是强酸

B．Y、Z和W三种元素位于同一周期

C．X、Y、Z和W均为非金属元素

D．X和Y的最简单气态氢化物的稳定性：X＞Y

What is bound to happen if a judge is not capable of his work

A．Injustice.

B．He would be displaced.

C．He would be dismissed.

D．Miscarriage.