题目内容
(72) is a protocol that most USENET machines now use it to allow news articles to propagate from one machine to another over a reliable connection.
(73) is an approach preferred by cable TV providers. In this solution the fiber terminates at an optoelectrical converter and the final segment is a shared coaxial cable.
(74) is a device used to connect two separate network that use different communication protocol.
(75) is a digital-to-digital polar encoding method in which the signal level is always either positive or negative.
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听力原文：M: One of the most common questions we ask about people's behavior. is why. Why does she say this？ Why does he do that？ Sometimes the reason is obvious. For example, someone is driving down the street, the light turns red, and he stops, why？
W: Because he has to, legally I mean.
M: Exactly! In this case the reason is obvious, so we usually don't question it. But when the reason is not so obvious and especially when the behavior. could have negative consequences, we're more likely to feel a need to explain the catkins of the behavior. Social psychologists have a term for this, for the process of explaining the muses of behavior. It's called causal attribution. And one theory suggests there's a pattern in the way we go about attributing causes to people's behavior. According to this theory, there are two categories of reasons: internal factors and external factors. Again, Lisa, say you're driving down the road and all of a sudden some guy turns into the lane right in front of you, and you have to slam on your brake to avoid an accident. How do you react？
W: I'll probably get very angry.
M: Because.
W: Well, he's not paying attention; he's a bad driver.
M: So you automatically attribute the driver's behavior. to an internal factor. He himself is to blame because he is careless.
W: So if I said it was because of heavy traffic or something. I'd be attributing his behavior. to an external factor, something beyond his control.
M: Good. Now how will you explain your own negative behavior？
W: I should blame external factors.
M: That's right.
(24)
A．Most Londoners took Exercise Flood Call calmly.B．Most Londoners were frightened.C．Mo
A．4B/SBB．CRCC．Manchester CodeD．Huffman Code
仿生设计学以自然界万事万物的“形”、“色”、“音”、“功能”、“结构”等为研究对象，有选择地在设计过程中应用这些特征原理，同时结合仿生学的研究成果，为设计提供新的思想．新的原理、新的方法和新的途径，其中，结构仿生设计学主要研究生物体和自然界物质存在的内部结构原理在设计中的应用问题，适用于产品设计和建筑设计。
根据上述定义，下列属于结构仿生设计的是
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