People wear hats for three main reasons: protection, communication, and decoration. Protection. People first began to wear hats to ___1___ themselves from the climate. In hot, sunny climates, wide-edged hats provide ___2___ from the sun. In cold climates, people often wear wool hats. In some regions, people wear a variety of protective hats, ___3___ the season. They may wear a wool hat in winter, a rain hat in spring or fall, and a wide-edged hat in summer. Hats also provide protection in certain ___4___. Construction workers, football players, military personnel, and people in many other fields wear metal or plastic helmets(头盔)for protection from ___5___. Communication. Hats can communicate various things about the people who wear them. The hats of coal miners, cowboys and firemen indicate the wearer's ___6___. Students may wear a mortarboard (学位帽) to show they are graduating from high school or college. Decoration. Most people wear a hat that they believe makes them look attractive, ___7___ the hat's main purpose may be protection or communication. Many protective hats are attractive and stylish. Even the caps of police officers and military personnel are designed to ___8___ the wearer's appearance. Certain decorative hats are worn as a (n) ___9___. In Scotland, for example, people wear a cap called a tam-o'-shanter that is part of their national costume (服装). Many people change their style of hat from time to time because they feel more ___10___ when keeping up with the latest fashion. 1. A. defend     B. protect    C. prevent   D. hide 2. A. shade    B. shadow      C. security    D. cover 3. A. resulting from  B. basing upon C. relating to  D. depending on 4. A. seasons      B. climates     C. activities    D. communities 5. A. injury     B. destruction   C. harm   D. pollution 6. A. experience     B. occupation  C. personality  D. education 7. A. as   B. unless   C. though  D. because 8. A. change    B. increase   C. display   D. improve 9. A. tradition  B. label    C. honour     D. fashion 10. A. sociable    B. informal    C. attractive    D. noble