题目内容
阅读下面材料,在空白处填入适当的内容(1个单词)或括号内单词的正确形式。
A triathlon(三项全能运动) is a sports event which combines three sports,1. (typical) running, biking, and swimming. During a triathlon, athletes finish all three sports without stopping 2. (beat) the clock. People of all ages and sizes can compete in triathlons. But much like other sports events, a lot of professional 3. (compete) rule the triathlon world. In addition, many triathlon 4. (hold) to benefit charity, much like marathons.
The modern triathlon appeared in California in 5. 1970s. It usually begins with the swimming, 6. (follow) by cycling, and finally running. A triathlon tests the endurance(忍耐力) and speed of an athlete, as well as his or her ability to keep energy and focus 7. the race as a whole. A triathlon competes against a clock, rather than against other athletes. A variation of the triathlon is a relay triathlon, 8. a different athlete completes each stage.
The swimming stage takes place in a lake or the open ocean. As soon as athletes come out from the water, they change into cycling at the 9. (fast) speed to save time. After cycling, the athletes change shoes to run. The course is considered complete once the athletes 10. (cross) the finish line.