The semantic ________of idioms is reflected in the illogical rel

The semantic ________of idioms is reflected in the illogical relationship between the literal meaning of each word and the meaning of the idiom, as is shown in rain cats and dogs, which means “rain heavily”.
【正确答案】：unity
【题目解析】：本题考查的是习语的特点，已知信息是习语中每个词的字面意思不能反映整个习语的意思，习语具有的特点根据课本第162至163页的特点描述，指的是semanticunity这个特点。