当基于已有类创建子类的时候，已有类称为父类或基类，这个新类称为子类或派生类。When subclasses are created based on existing classes, existing classes are called parent classes or base classes, and this new class is called subclasses or derived classes.? 错误|正确

下列属于Java中有效的关键字的是（ ）。 A: native B: method C: subclasses D: array E: Float F: string

An advantage of inheritance is that: ( ) A: Objects of a subclass can be treated like objects of their superclass. B: All methods can be inherited. C: All instance variables can be uniformly accessed by subclasses and superclasses. D: None of the above.