题目

   A triathlon(三项全能运动) is a sports event which combines three sports.  61 (typical) running, biking, and swimming. During a triathlon, athletes finish all three sports without stopping  62  (beat)the clock. People of all ages and sizes can compete in triathlons. But much like other sports events, a lot of professional  63  (compete)rule the triathlon world. In addition, many triathlon  64  (hold) to benefit charity, much like marathons.1111]    The modern triathlon appeared in California in  65  1970s. It usually begins with the swimming.  66  (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  67  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.  68  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  69  (fast) speed to save time. After cycling, the athletes change shoes to run. The course is considered complete once the athletes  70  (cross) the finish line. 答案：61.typically  62.to beat  63.competitors  64.are held 65.the 66.followed 67.on  1111] 68.where   69.fastest 70.have crossed

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