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听力原文：M: What are you going to give Laura for her birthday party, Jane？
W: I planned to give her a watch, but I changed my mind. Now I've decided to give her a stamp album.
What gift will Jane give to Laura for her birthday？
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听力原文：M: Your house looks nice. What did you do to it？
W: I had it painted.
What did the woman do？
Frame. Relay is simplified form. of(71), similar in principle to(72), in which synchronous, frames of data are routed to different destinations depending on header information.
Packets are routed throught one or more Virtual Circuits known as(73)Most Virtual Circuits are(74), which means that the network provider sets up all DLCI connections at subscription time.(75)are also part of the Frame. Relay specification. They privide a link that only lasts only as long as the session.
A．00 01000100 1101（二进制)B．01 00100011 0100（二进制)C．10 1000 1111 1000（二进制)D．11 01
A．大数难以分解因子B．大数容易分解因手C．容易获得公钥D．私钥容易保密
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