Althoughmanymodificationshavebeenmadeinit,thegameknownintheUnitedStatesasfootballcanbetraceddirectly

参考答案:

B

名词辨析。modification更改，修改，修正：The law，in its present form，is unjust；it needs modification．现行的法律是不公正的；它需要修改。change改变，变化，转变：a change in facial expression面部表情的变化。rule规定，规则，惯例，统治：The rule is that someone must be on duty at all times．按照规定，任何时候均需有人值班。demand要求，需求，需要：granted the employees' demands．满足雇员的需求。league同盟，联盟，社团：Our team plays in the football league．我们队在足球联赛中参加比赛。