Which of the following is one of the characteristics of idioms?（）
A、Semantic unity.
B、Lexical manipulation.
C、Phonetic unity.
D、Structural variation.
【正确答案】：A
【题目解析】：idioms有两个特征：semantic unity 和structural stability。A选项符合
Which of the following is one of the characteristics of idioms?（
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