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If you are a young college student, most of your concerns about your health and happiness in life are probably(S1)__________ on the present. Basically, you want to feel good physically, mentally, and(S2) _________ now. You probably don’’t spend much time worrying about the(S3)_________ future, such as whether you will develop heart disease, or (S4) ________, how you will take care of yourself in your (S5) ________ years, or how long you are going to live. Such thoughts may have (S6) _________ your mind once in a while, however, If you are in your thirties, forties, fifties, or older, such health related thoughts are likely to become (S7) _______important to you. (S8) ________ that will help you feel better physically and mentally. Recently researchers have found that, even in late adulthood, exercise, strength training with weights, and better food can help elderly individuals significantly improve their health and add happiness to their life. (S9) ________ giving us the opportunity to avoid some of the health problems that have troubled them. (S10) ________.

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Christmas is coming. It is celebrated(庆祝) every year on December 25 and it is the most celebrated holiday in the world. It is celebrated in Europe, North America, South America and in every country that has been touched by western culture. Christmas celebrates the birth of Jesus Christ. Today, most people who celebrate Christmas are not Christians(基督徒). They celebrate the holiday because Christmas is an opportunity for people to show the "good feelings" they have for each other. Christmas is called "the season of giving". It is the time of year when people give gifts to others to show how much they love them or just to show how much they appreciate(感激) them. We give gifts to our family and we also give gifts to close friends. Many people also give gifts to people who have performed services for them through the year, like the postman or the cleaner. And Christmas is the time of year we remember that many people are less fortunate than us: the poor, the sick and the lonely; and we try to help them in any way we can. We give gifts to family and friends because in this way we can get something back.

A. Right.
B. Wrong.
C. Doesn’t say.

在计算机通信中,必须将数字信号转换成适于传输的模拟信号后.通过传输线路进行远距离传送;在接收端又必须将接收到的模拟信号恢复到原来的数字信号。实现此功能的方法是将微型计算机与电话系统之间连接上______。

回调(Callback)函数是面向过程的程序设计语言中常用的一种机制,而设计模式中的 (45) 模式就是回调机制的一个面向对象的替代品。该模式的意图是 (46) 。

A. 使原本由于接口不兼容而不能一起工作的那些类可以一起工作
B. 将一个请求封装为一个对象,从而可用不同的请求对客户进行参数化,将请求排队或记录请求日志,支持可撤销的操作
C. 定义对象间的一种一对多的依赖关系,当一个对象的状态发生改变时,所有依赖于它的对象都得到通知并被自动更新
D. 使算法可独立于使用它的客户而变化

因特网(Internet)最基本的通信协议是______。

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