This question examines humanistic common sense. Item a is correct. This sentence comes from "Golden Dress" written by an anonymous person (Du Qiuniang) in the Tang Dynasty, which means that I hope you don't covet those luxurious things and cherish the good times of your youth. Later, it was used to persuade people to cherish time and not to value external prosperity. Mistake B, this sentence comes from He's Homecoming Book in the Tang Dynasty, which means that I won't go home until I am old and young. Although my local accent hasn't changed, my hair on my temples has come loose. It expresses the author's feelings and helplessness about the changes of life, the vicissitudes of time and the things that have changed. Item c is correct. This sentence comes from Li Bai's Two Poems of Meeting in the Tang Dynasty, which means that time flies and time waits for no one. In a blink of an eye, black hair becomes white silk, which is intended to persuade people to cherish time. Item d is correct. This sentence comes from Zhou Xingsi's Thousand Characters, which means that jade is not a treasure, and an inch of time is worth an inch of gold. How can it be wasted? It aims to persuade people to cherish time.