题目

观察下列各式: 1×3+1=4=22， 2×4+1=9=32， 3×5+1=16=42，4×6+1=25=52，…….请将你所发现的规律用含字母n的式子表示出来:________; 答案：p;【答案】n×(n+2)+1=解析:p;【解析】由题中的几个式子可以得出规律：n×(n+2)+1= Cars are an important part of life in the United States. Most people feel that they are poor without cars. Though he is poor, he doesn't feel really poor when he has a ear.   Henry Ford was the man who first started making cars. Maybe, he didn't know how much the car was going to affect the United States. The cars made the United States a country on wheels. And they have helped to make the United States a rich and modern country.   The car has become popular in the United States today. The country is a very large one. The Americans like to move around in it. It is the easiest and cheapest way to travel in cars. With a car people can go to any place without spending a lot of money. 1. In the United States               A. most people are too poor to buy cars      B. poor people wouldn't like to buy cars      C. all the poor people have cars      D. people think they are poor if they don't have cars 2. What was Henry Ford?      A. He was a car maker.     B. He was a car driver. C. He was a car seller.      D. He was a traveler in a car. 3. According to the writer, cars in the United States      A. are the nicest            B. run fastest      C. make the country richer    D. make the country beautiful 4. The Americans like to move in cars because      A. there are no trains in the United States      B. cars can take them to any place they want to go      C. it doesn't take them much money to travel in cars      D. both B and C 5. Which is the best title(标题)? A. A Country on Wheels    B. A Rich and Modern Country C. Making Cars           D. Traveling in Cars