Atriathlon(三项全能运动)isasportseventwhichcombinesthreesport...

问题详情：

A triathlon(三项全能运动) is a sports event which combines three sports, 　41　(typical)running, biking, and swimming. During a triathlon, athletes finish all three sports without stopping 　42　(beat) the clock. People of all ages and sizes can compete in triathlons. But much like other sports events, a lot of professional 　43　(compete) rule the triathlon world. In addition, many triathlons　44　 (hold) to benefit charity, much like marathons.

The modern triathlon appeared in California in 　45　 1970s. It usually begins with the swimming, 　46　(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 　47　 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, 　48　 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 　49　(fast) speed to save time. After cycling, the athletes change shoes to run. The course is considered complete once the athletes 　50　(cross)the finish line.

【回答】

41． typically

42．to beat

43．competitors

44．are held

45．the

46．followed

47．on

48．where

49．fastest

50．have crossed

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