—The leaders are supposed to care about the sufferings of the people.

—Contrary to that, some of them act with their eyes _______ to the reality.

A．closing

B．closed

C．to close

D．being closed

X，Y，Z是3种短周期元素，其中X，Y位于同一族，Y，Z处于同一周期。X原子的最外层电子数是其电子层数的3倍，Z原子的核外电子数比Y原子少1。下列说法正确的是[ ]

A．元素非金属性由弱到强的顺序为Z<Y<X

B．Y元素最高价氧化物对应水化物的化学式可表示为H₃YO₄

C．3种元素的气态氢化物中，Z的气态氢化物最稳定

D．原子半径由大到小的顺序为Z>Y>X