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甲国分立为乙国和丙国，关于甲国原加入的对其全部领土生效的《国际民用航空公约》对乙国和丙国是否有效，以下正确的是？
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甲乙两国缔结双边条约，以下属于条约终止和暂停的原因有哪些?
Listen to the excerpt again and fill in the blanks with words or short phrases from the interview.1.In Mexico，some people look down upon others because of the class ________________.2. From the interviewee’s perspective, children in Mexico did not have very much ______________.3. In Mexico, to show respect for the old, you should ____________ to the elderly on the bus.4. If someone invites you to their house，you should give compliments on the house and invite them to your house， too.If you area visitor and do not have a house there，you are supposed to invite them for _________or something like that.5. When you visit someone's house in Mexico, and you give him or her a very expensive gift，it could ________.
早在1995年，提出物联网设想的是（）。
常用的身份证、一卡通等RFID系统的工作频段是（）。
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