3.In Europe, schoolchildren devote time during each school day to calisthenics. North American schools rarely offer a daily calisthenics program. Tests prove that North American children are weaker, slower, and shorter-winded than European children. We must conclude that North American children can be made physically fit only if they participate in school calisthenics on a daily basis. Which one of the following is assumed in the passage? (A) All children can be made physically fit by daily calisthenics. (B) All children can be made equally physically fit by daily calisthenics. (C) Superior physical fitness produces superior health. (D) School calisthenics are an indispensable factor in European children’s superior physical fitness. (E) North American children can learn to eat a more nutritious diet as well as to exercise daily. 大案"d 但个人以为indispensable 不妥,说SC是EPF的不可剥夺的因素 就是说是必要条件 但是有可能是很多因素加上SC一起使得EPF , 希望讨论.
个人觉得题干的结论是,North American childeren physically fit (NA PF)=>school calisthenics (SC). (only if A, B== B=>A). 那么题目就是要在NA PF 和E PF (euoprean children physciall fit)之间建立某种关系,这个关系由D:E PF=> SC 来建立。