A：专家系统是人工智能应用研究最活跃最广泛的课题之一
B：专家系统是由一些计算机科学家组成的工作团队
C：专家系统是一种模拟人类专家解决问题的计算机程序系统
D：专家系统是一个智能计算机程序系统
东北三省东面和北面的邻国分别是（ ）
—The cost of food and clothing is going up nearly every day.
—Yes, the price of vegetables is much than before.
下列关于绿色植物的说法中错误的是（ ）
Vienna is famous for having many great musicians. ____, Johann Strauss the younger wrote hundreds of wonderful pieces of music there.
