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閱讀下面短文,掌握其大意,然后從各題所給的四個選項（A、B、C、D）中，選出最佳選項。
Before the 1950s,running the mile in under four minutes was considered impossible．Gradually though,times for the mile run did 1 ．By the early 1950s,it looked as though a four minute mile was indeed 2 ．
A British 3 ,Roger Bannister,decided to try to break the four minute barrier．The decision to work for this 4 meant hours of painful,boring preparation ahead of him,but to Bannister,the goal was well worth the 5 ．In December,1953,his 6 began．It included a series of ten quarter-mile sprints（全速跑）,to be done in sixty seconds each．He 7 himself a two-minute rest after each quartermile．By early February of 1954,he had gotten his time down to 8 seconds;this meant a 4∶04 mile．Here Roger reached a plateau（停滯）．He couldn't 9 to get his time for the quarter-mile down to 60 seconds． 10 ,he and a friend took time away from training to go mountain climbing in Scotland for three days．This 11 was conside quite reckless（輕率的）,since a sprained ankle（扭傷踝骨）could 12 him weeks of valuable training．However,the mountain climbing 13 gave him the mental advantage he needed．When he 14 training,he ran the ten guarter-miles again;his time was down to 59 seconds for each quarter mile sprint．
When 15 day arrived,strong winds were blowing and running conditions were poor．What a 16 decision！Should he run,going for he 17 ?Or,should he wait for the next race,days later,hoping for the 18 to improve?If he did wait,he risked losing his peak physical and mental 19 Bannister decided to go ahead．It was the 20 decision．At race time,the wind died somewhat,and Bannister ran effortlessly,the fastest mile in human history in— under four minutes．
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