In It's Hard to Walk, the author uses a variety of artistic expressions to express his feelings. "The cost of pure wine is a gold cup, 10,000 copper coins and a hip flask, and the jade plate is precious and ashamed, and it costs 10,000 yuan" to express the pain in the heart by drinking; "I would like to cross the Yellow River, but the ice will choke on the ferry, and Taihang Mountain will be covered with snow" is used to symbolize the reality of the world compared with the natural scene, the difficulty and danger of the road, and the official career; "I will sit on a fishing rod and lie lazily by the stream, but I suddenly dream of driving a boat and sailing towards the sun" and "I will one day ride the Changfeng to break the huge waves, straighten my shady sail and cross the deep sea" are allusions. They express their hopes and beliefs about the future through ancient examples and speeches. The answer is a.