Which of the following is an idiom adjectival in nature?（ ）

Which of the following is an idiom adjectival in nature?（ ）
A、flesh and blood
B、make ends meet
C、in nothing flat
D、as poor as a church mouse
【正确答案】：D
【题目解析】：本题考查常用的形容词性习语。 flesh and blood：血肉之躯；​make ends meet：收支平衡；in nothing flat：立刻；as poor as a church mouse：一贫如洗的。形容词性习语都有一个形容词充当关键词，而且在句中用作形容词。故D选项符合题意。