分析HCl、X、HClO、KClO3、KClO4的排列顺序规律,可知X代表的是( )
A:NaCl
B:Ca(ClO)2
C:Cl2
D:Cl2O3
下列有关节肢动物的叙述,错误的一项是( )
It is generally believed that mutual understanding ______ a happy marriage and life.