A、The first snowboards were made in the 1960s. However, it was in the late 70s that they became more__21__. Throughout the80s, more and more people began taking up the sport, even though snowboards were not allowed on most ski hills. __22__ its earlier problems, snowboarding is now the world’s __23__ growing winter sport and most resorts(度假地)welcome snowboards.
B、In 1963, a Grade 8 student named Tom Sims __24__ a ski-board for a school project in New Jersey. Then, in 1966, a man name Sherman Poppen __25__ two skis together for his kids on Christmas day. He called his invention “ the Snurfer,” which __26__ the words “snow” and “surf”. In 1969, Jake Burton Carpenter received a __27__ for Christmas. He soon began designing boards, and today “Burton” is a popular __28__ of snowboard.
C、By the 1980s, snowboarding had become very popular. __29__, most ski resorts did not allow snowboarding because they thought it was too __30__.Since many snowboarders were young, many older skiers did not want them on the ski hills. The snowboarders had to go to the backcountry, __31__patrolled（有巡逻的）resorts.
D、Rejection at the resorts did not __32__ snowboarding from growing in popularity. Eventually, the owners of ski resorts changed their views. They __33__ that they could make more money by allowing snowboarding. One by one, the resorts __34__ to welcome snowboards. Today, many resorts even set __35__special areas where snowboarders can practice their creative tricks.
E、21. A spreading B popular C ordinary D interesting