Which of the following is NOT one of the characteristics of idioms?（ ）
A、The constituents of idioms can be replaced.
B、The word order cannot be inverted or changed.
C、Many idioms are grammatically unanalysable.
D、The constituents of an idiom cannot be deleted or added to.
【正确答案】：A
【题目解析】：习语的特点：词序不能颠倒或更改。许多成语在语法上是无法分析的。不能删除或添加成语的成分。A是错误的，所以选A。
