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 sllege.
Decoration. Most people wear a hat that they believe makes them look attractive, ___7___ the hat's main purpose may be protemmunication. 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.