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采用广播信息的方法来决定与特定硬件MAC地址相对应的IP地址的协议称为____协议。
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联合国是于（）年成立的。
UDP根据____对应用程序进行多路复用，并能利用校验和检查数据的完整性。
教育要适应个体身心发展的不平衡性、顺序性、阶段性、互补性和__________。
Wang ling, a middle school girl, felt angry with her parents after getting a boy’s phone call. "A classmate called me to discuss homework with him. We talked (1) just a few minutes before my parents got mad," said the girl. "They asked whether I liked the boy. I said I didn’t (2) they wouldn’t believe me. "Wang’s trouble is not strange at all because puppy love(早恋)becomes a big headache for (3) parents and schools. They worry that puppy love will be bad for (4) . Her school makes it a rule not to allow any talk or any physical contact(身体接触) (5) one boy and one girl alone.Many students say they understand (6) parents and teachers are so nervous about puppy love. But some think they are going too far. "We have our own thoughts and we know what to (7) with it," said Wang Ling.Another girl, Jiang Ting, liked making friends with boys. "Boys and girls can learn from each other, "she said. "My mother asks me to study hard. However, she (8) stops me from making friends with boys. "Once Jiang told her mother she might fall in love with a boy. Her mother let Jiang make (9) own decision. Soon Jiang found that she didn’t like him any more because the boy was not as (10) as what she had thought before. And she did worse and worse in her subjects because she spent much on it. At last she understood the worry from schools and most parents about puppy love. 第（4）空应选择（）
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