第30题: [单项选择]Although many modifications have been made in it, the game known in the United States as football can be traced directly to the English game of rugby. A. rules B. changes C. demands D. leagues 参考答案:B 答案解析:[解析] 名词辨析。 modification更改,修改,修正:The law,in its present form,is unjust;it needs modification