第12题: [单项选择]A) One of his cousins is getting married. B) The final exams are coming. C) He hasn’t decided what to buy for his cousin. D) He has little time to tour California. 参考答案:C 答案解析:[听力原文] 22-25 W: I have heard that you are going to California next week. What for M: One of m
第29题: [单项选择]若特快订单是一种订单,则特快订单类和订单类的关系是( )。 A. 使用关系 B. 包含关系 C. 继承关系 D. 无关系 参考答案:C 答案解析:[解析] 继承是允许将一个类定义为一个更通用类的特例。特殊类称为子类,通用类称为父类。除了订单类的属性外,特快订单类可能还有其他一些特殊属性。显然,订单类是通用类,即父类;而特快订单类是定单类的一个特