题目内容
UDP提供可靠的连接,所以应该优先考虑使用。
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在socket使用过程中，服务器端先初始化Socket，然后与端口绑定(bind)，对端口进行监听(listen)，调用accept阻塞，等待客户端连接。
客户端初始化一个Socket后连接服务器(connect)，如果连接成功，这时客户端与服务器端的连接就建立了。
客户端初始化一个Socket后需要启动线路侦听（listen）才能知道是否可以连接服务器端。
[音频]Many college students today own personal computers that cost anywhere from $1,000 to perhaps $5,000 or more. (1)_________,it is not uncommon for them to purchase (2)_________costing another several hundred dollars. Twenty years ago, computers were (3) ________, but they were very large and extremely expensive. Few, if any,(4) __________ purchased computers for home use. Over the years, the price of the “guts” of a computer---its memory—has declined to less than a thousandth of the price per unit of memory that prevailed twenty years ago. This is the main reason why computers cost so much less today than they used to. Moreover, (5) ________ improvements have made it possible to (6)__________ memory circuitry(储存器电路)that is small enough to fit intothe portable personal computers that many of us own and use. (7)___________, as the price of computation has declined the average consumer and business have spent more on purchasing computers.(8)___________,improved agricultural technology, hybrid(杂交) seeds,(9)_________animal breeding, and so on have vastly increased the amount of output a typical farmer can produce. The prices of goods such as meats and grains have fallen sharply relative to the prices of most other goods and services. As agricultural prices have fallen, many households have decreased their total expenses on food. Even though the (10)______________of a product purchased generally increases when its price falls, total expenses on it may decline.
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