The first step of analysis: judge the first logical relationship between stem words and make multiple-choice questions in the options. "Paper" and "wood" correspond. "Wood" is the raw material, "paper" is the finished product, and "wood" is made into "paper", which conforms to this logic. Step 2: judge the second logical relationship between the stem words again, and make multiple-choice questions in the options, in which "paper" in C is made into "book" and "flour" in C is made into "bread", which is consistent; The "bridge" in D can't be a "railway". So the correct answer is C.