Given: class ClassA {} class ClassB extends ClassA {} class ClassC extends ClassA {} and: ClassA p0 = new ClassA(); ClassB p1 = new ClassB(); ClassC p2 = new ClassC(); ClassA p3 = new ClassB(); ClassA p4 = new ClassC(); Which three are valid?()
【简答题】听下面5 段对话。每段对话后有一个小题,从题中所给的A 、B 、C 三个选项中选出 最佳选项。 1. Where does the conversation most probably take place? A. At home. B. At a restaurant. C. In an Intemet cafe. 2. What is the man speaker? A. A bank cl...