阅读理解。 According to the American Automobile Association, since 1964 all cars sold in the United States have been equipped with seat belts. (These are also called safety belts.) Mary studies of automobile accidents have shown that safety belts can save lives. One study showed that forty percent of those killed in auto accidents could have been saved if they had been wearing seat belts. Unfortunately belts are worn only by a small percentage of drivers and passengers-about fifteen percent in cities, and only nine percent in small towns. And safety belts cannot protect people who do not wear them. In order to find out what kinds of people do wear seat belts a study was made in several cities of the United States. The following facts were learned about those who use their safety belts: 1. They do not smoke while driving. 2. They have had more education than non-users. 3. They know someone who was injured(but not killed)in an automobile accident. Advertisements based on these facts have been printed in newspapers and magazines in order to teach people the importance of using seat belts. But these advertisements have not helped much. Some people believe there should be a law requiring drivers and passengers to use safety belts. In Australia, where there is such a law, deaths in auto accidents have decreased twenty-four percent. 1. This selection is mainly about _____. A. automobiles in the United States B. accidents involving cars C. safety belts for drivers and passengers D. parking problems 2. The selection says that in Australia _____. A. about 50% of the drivers wear seat belts B. the importance of seat belts is advertised in newspapers C. few people use seat belts and magazines D. a law requires drivers and passengers to use seat belts 3. People who live in small towns _____. A. have fewer accidents than those who live in cities B. are less likely to wear seat belts than those who live in cities C. ten to favor the passing of a law to require the use of seat belts D. often wear seat belts 4. In Australia, where there is such a law, deaths in auto accidents have decreased _____. A. fifty percent B. ten percent C. fifteen percent D. twenty-four percent