单选题 The first snowboards were made in the 1960s. However, it was in the late 70s that they became more {{U}} {{U}} 1 {{/U}} {{/U}}. Throughout the 80s, more and more people began taking up the sport, even though snowboards were not allowed on most ski hills. {{U}} {{U}} 2 {{/U}} {{/U}}its earlier problems, snow boarding is now the world's {{U}} {{U}} 3 {{/U}} {{/U}}growing withter sport and most resorts (度假地) welcome snowboards. In 1963, a Grade 8 student named Tom Sims {{U}} {{U}} 4 {{/U}} {{/U}}a ski_board for a school project in New Jersey. Then, in 1966, a man named Sherman Popenn {{U}} {{U}} 5 {{/U}} {{/U}}two skis together for his kids on Christmas day. He called his invention "the Snuffer," which {{U}} {{U}} 6 {{/U}} {{/U}}the words "snow" and "surf". In 1969, Jake Burton Carpenter received a {{U}} {{U}} 7 {{/U}} {{/U}}for Christmas. He soon began designing boards, and today "Burton" is a popular {{U}} {{U}} 8 {{/U}} {{/U}}of snowboard.
By the 1980s, snowboarding had become very popular. {{U}} {{U}} 9 {{/U}} {{/U}}, most ski resorts did not allow snowboarding because they thought it was too {{U}} {{U}} 10 {{/U}} {{/U}}. Since many snowboarders were young, many older skiers did not want them on the ski hills. The snowboarders had to go to the backcountry, {{U}} {{U}} 11 {{/U}} {{/U}}patrolled (有巡逻的) resorts.
Rejection at the resorts did not {{U}} {{U}} 12 {{/U}} {{/U}}snowbarding from growing in popularity. Eventually, the owners of ski resorts changed their views. They {{U}} {{U}} 13 {{/U}} {{/U}}that they could make more money by allowing snowboarding. One by one, the resorts {{U}} {{U}} 14 {{/U}} {{/U}}to welcome snowboards. Today, many resorts even set {{U}} {{U}} 15 {{/U}} {{/U}}special areas where snowboarders can practice their creative tricks.