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Among the following idioms, “_______’’ is an idiom adverbial in nature.
A、flesh and blood
B、up in the air
C、as poor as a church mouse
D、tooth and nail
【正确答案】：D
【题目解析】：B本题考查习语的性质，A 指的亲戚，名词性的。B不是习语。C是形容词性的，D 是个副词短语。