A:含氧酸的酸性:H3ZO4>H2YO4>HXO4
B:非金属性:X>Y>Z
C:气态氢化物的稳定性按X、Y、Z顺序由弱到强
D:元素的负化合价的绝对值按X、Y、Z顺序由大到小
Seeing a stranger with a knife in his hand, the little girl stood under the tree, ________ out of her mind.
香港最大的进出口贸易伙伴是( )