Test and analysis: b tomorrow yellow flower: yellow flower, chrysanthemum. Originally refers to the chrysanthemum that gradually withered after the Double Ninth Festival. The latter refers to outdated things or news. Out of context. A Gua Tian Li Xia: It comes from "Gua Tian doesn't accept shoes, Li Xia doesn't have a full crown", which means that a gentleman should take the initiative to stay away from some controversial people and things and avoid unnecessary suspicion. C waves over the clouds: paradox, paradox: strangeness, change. Like clouds and waves, the shape is unpredictable. The original description of the building structure is as varied as clouds and waves. The latter describes things as unpredictable. . A Qin and a crane: It turns out that Zhao Bian went to Sichuan to be an official, and all he took with him was A Qin and a crane. Describe simple clothes, but also metaphor honest and clean. Four-choice idioms are easy to be misused in life, so we should pay attention to the meaning and usage of common idioms, and pay attention to the evaluation and application of idioms.