. B　细节理解题。 根据第四段“Consequently, I threw myself heartily into my work for the rest of the school year.”可知作者是通过throw oneself into(积极从事)而实现转变的。所以选B。文中老师并没有给作者机会重做，所以A错误；从祖父那里得到建议是在选择华盛顿身份时，所以C错误；而校长是在作者成绩提高后才接见的，所以D错误。Cars are an important part of life in the United States. Without a car most people feel that they are poor. And even if a person is poor he doesn’t feel really poor when he has a car.

　　Henry Ford was the man who first started making cars in large numbers. He probably didn’t know how much the car was going to change American culture. The car made the United States a nation on wheels. And it helped make the United States what it is today.

　　There are three main reasons why the car became so popular in the United States First of all the country is a big one and Americans like to move around it. The car makes the travel the most comfortable and cheapest. With a car people can go to any place without spending a lot of money.

　　The second reason cars are popular is the fact that the United States never really developed a practical and cheap public travel system. Long distance trains have never been as common in the United States as they are in other parts of the world. Now there is a good system of air- service provided by planes. But it is too expensive to be used often.

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