第24题: [单项选择]What is said about the research paper A. The paper came out as short as I expected. B. Actually the paper was long enough to cover it. C. The paper was short enough to present. D. The paper turned out better than I had expected. 参考答案:D 答案解析:比较结构。根据原文“The research paper was very brief, but still it was better than I expected.”,译文为:这篇论文很简短,但
第31题: [单项选择]下面对对象概念描述错误的是 A. 任何对象都必须有继承性 B. 对象是属性和方法的封装体 C. 对象间的通讯靠消息传递 D. 操作是对象的动态属性 参考答案:A 答案解析:[解析] 继承是面向对象的方法的一个主要特征。继承是使用已有的类定义作为基础建立新类的定义技术。 已有的类可当做基类来引用,则新类相应地可当做派生类来引用.但并不是所有的对象都必须有继承性。因此,选项