1、If you hadn’t known them, you would have thought Joe and Jim were quite alike. 2、They were both tall and wore long and fair hair. 3、They both spoke in a deep voice that made themselves seem much older than they really were. 4、Both of them wore dark clothes as a rule, and they liked light colored ties. 5、But that was all the likeness they had. In other things they were sharply different. 6、Joe was considerate and helpful, and everyone liked him. 7Jim, however, was very selfish and often burst into terrible anger at little things that displeased him. 8、Alike as Joe and Jim were on the surface, they were really very different in nature.Which sentence is the main idea of this paragraph?
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Which sentences are the main idea of this paragraph?1、Good manners are important in all countries, but ways of expressing good manners are different from country to country. 2、Americans eat with knives and forks; Japanese eat with chopsticks. 3、Americans say“Hi” when they meet; Japanese bow.4、Many American men open doors for women; Japanese men do not. 5、 On the surface, it appears that good manners in America are not good manners in Japan, and in a way this is true. 6、But in any country, the only manners that are important are those involving one person’s behavior toward another person. 7、In all countries it is good manners to behave considerately toward others and bad manners not to. 8、It is only the way of behaving politely that differs from country to country.
A. 1and2
B. 5and6
C. 1and8
D. 7and8
程序语言的语义需要用()来描述。
A. 上下文无关文法
B. 上下文有关文法
C. 正规文法
D. 短语文法
2型文法对应()。
A. 图灵机
B. 有限自动机
C. 下推自动机
D. 线性界限自动机
下述结论中,()是正确的。
A. 1型语言⊂0型语言
B. 2型语言⊂1型语言
C. 3型语言⊂2型语言
D. A~C均不成立