Complete the following statements with proper words or expressions according to the course book.Due to structural ( )of idioms, the word order of the idiom “by twos and threes” cannot be turned into “by threes and twos”.
【正确答案】:STABILITY
【题目解析】:一个习语的结构在很大程度上是不可改变的,如:习语的组成成分不可替换、习语的顺序不能倒装或改变(如by twos and threes“三三两两地;零零星星地”)、习语的组成成分不能删除或增加,哪怕是一个冠词、很多习语在语法上是不可分的。