补全feifei逻辑第120的D选项

120. In Europe, schoolchildrendevote time during each school day to calisthenics. North American schoolsrarely offer a daily calisthenics program. Tests prove that North Americachildren are weaker, slower, and shorter-winded than European children. We mustconclude that North American children can be made physically fit only if theyparticipate in school calisthenics on a daily basis.

Which one of the following isassumed in the passage?

A.      Allchildren can be made physically fit by daily calisthenics.

B.      Allchildren can be made equally physically fit by daily calisthenics.

C.      Superiorphysical fitness produces superior health.

D.      Schoolcalisthenics are an in indispensable factor in European children’s superiorphysical fitness.

E.      NorthAmerican children can learn to eat a more nutritious diet as well as toexercise daily.