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活动期结节病可有下述改变，除了
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The passage is most likely a part of ______.
Internet采用了目前在分布式网络中最为流行的(51)方式，大大增加了网络信息服务的灵活性。
因特网的一个(52)可使用一个主机的IP地址和端口来定义。
听力原文：F: Henry, Christmas is coming. Don't you think that we should get something for the kids？
M: Of course. But I'm too busy to think of such thins. You see people throng to our store to get Christmas gifts.
F: But it's so convenient for you. You can just pick up something when you are having a break.
M: OK. But you should tell me first what do you want for the kids.
F: Well, that's why I'm talking to you. What do you think they should be given？
M: Jerry has grown up. Maybe we can give him something different from last few years. Instead of giving him some silly toys and snacks, I think we can get him a bicycle. What would you say？
F: That's a good idea. He will like it. And Jessie, she wants so much to have a Barbie doll, maybe we should buy one for her？
M: She has already had so many dolls. Every time she wants a new one badly, but then she gets tired of it within only three days. We should have told her to be more matured when making a decision.
F: Oh, Henry, she is only a girl of four years old! It's not fair and not reasonable to ask her to understand everything.
M: Don't argue with me, you know I like her better than I love Jerry. I'm just afraid that she would be spoiled.
Where does the man work？
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