第四部分 短文填空(共 10 小题;每小题 2 分) 阅读下面短文,在空白处填入 1 个适当的单词或括号内单词的正确形式。 Ac c ording t o a review of evidence in a medical j o ur n al , runners live three years 49 (long) than no n- run n ers . Y ou don't have to run fast or for long 50 (see)the benefit . You may drink , smoke,be overw e ight and still reduce your risk of 51 (di e ) early by running.While ru n n i ng reg ular ly can 't ma ke you live fore ve r , the revi e w says it 52 (be) more ef fec tive at lengthening life 53 walking , cycling or swim m ing . Two of the authors of the review also made a study p u blished in 2014 54 showed a mere five to 10 minutes a d a y of run n ing reduced the risk of hear t disease and e ar l y deaths from all 55 (cause). The best exercise is one that you enjoy and will do. But otherwise... it's probably running. To avoid knee pain,you can run on soft surfaces,do exercises to 56 (strength) your leg muscles( 肌肉 ),avoid hills and get good running shoes. Running is cheap,easy and it's always 57 (energy).If you are time poor, you need run for only half the time to get the same benefits as other sports, so perhaps we should all give 58 a try.