题目

 The park forbids _______ on the grass, but some parents don’t forbid their kids ______ on it.     A. to walk; to walk     B. to walk; walking    C. walking; to walk  D. walking; walking 答案：C3、与新航路的开辟有关的历史人物是 A．但丁         B达·芬奇           C．哥伦布           D．伏尔泰