近年来，等级考试的试题积累颇多。我们只能摘其要者，作些解释。古语云：应“授人以渔”，而非“授人以鱼”。“渔”表示捕捞的工具与方法，而“渔”仅是具体结果。因此，关键不在于学会几个具体问题的答案，而是掌握解决问题的知识与方法。 In recent years, the exam questions have accumulated a lot. We can only extract the best of them for some explanation. The old saying goes: “people should be given to fish” rather than “delegate to fish.” “Fishing” means fishing tools and methods, and “fishing” is only a concrete result. Therefore, the key lies not in learning to answer specific questions, but to master the knowledge and methods of problem solving.