根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。
Training for a marathon requires careful preparation and steady, gradual increases in the length of the runs. 36 , buy the best-fitting running shoes you can find. No one can say which brand will work best for you or feel best on your feet, so you have to rely on your experience and on the feel of each pair as you shop. When you have found shoes that seem right, walk in them for a few days to double-check the fit. 37 . As always, you should stretch(伸展) at least ten minutes before each run to prevent injuries.
During the first week, do not think about distance, but run five minutes longer each day. 38 , it is wise to take a day off to rest. But during the next week, set a goal of at least a mile and a half per run. 39 . After two weeks, start timing yourself. 40 . Depending on the kind of race you plan to enter, you can set up a timetable for the remaining weeks before the race.
36.
37.
38.
39.
40.
C
根据上文的“Training for a marathon requires careful preparation and steady, gradual increases in the length of the runs”和下文的“buy the best-fitting running shoes you can find”可知，这里应为准备工作。所以选C。
上下文理解错误。
E
上文提到：穿着鞋走走路以确保合适，下文提到跑。所以这里应该说如果穿着的感觉很好，就可以跑了。故选E。
根据上文的“ When you have found shoes that seem right, walk in them for a few days to double-check the fit”和下文的“before each run to prevent injuries”可知，因为确保了鞋合适，穿起来舒服的话，那么就可以用来跑步了，因此选择E。
上下文理解错误。
A
上文提到练习的第一周怎么做，下文提到第二周，所以这里应该是练习一周后稍做休息，一周是6天，故选A。
根据“During the first week”和“it is wise to take a day off to rest”一星期有七天，留最后一天休息，那么就是六天以后，所以选A。
上下文理解错误。
D
这里在讨论逐渐加长跑步的距离，每天增加一定的距离才合理，故选D。
根据前面的“set a goal of at least a mile and a half per run”和“Depending on the kind of race you plan to enter, you can set up a timetable for the remaining weeks before the race”可知，要慢慢的增加距离，因此选择D。
上下文理解错误。
G
准备工作--跑--有规律地练习--逐渐增量，那么接下来的就是提速了，所以选G。
最后是提速。在规定的距离内如何训练自己跑得快。这样才能参加比赛。
故选G。
上下文理解错误。