题目内容
虚拟存储管理系统的基础是程序的(12)原理，其基本含义是指程序执行时往往会不均匀地访问主存储器单元。根据这个原理，Denning提出了工作集理论。工作集是进程运行时被频繁地访问的页面集合。在进程运行时，如果它的工作集页面都在(13)内，能够使该进程有效地运行，否则会出现频繁的页面调入/调出现象。
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In the view of Assistant Professor Lise Eliot and others, repetition in language acquisition is of vital importance.
在常见的软件生命周期中，适用于项目需求简单清楚，在项目初期就可以明确所有需求，不需要二次开发的软件生命周期模型是(48)；适用于项目事先不能完整定义产品所有需求，计划多期开发的软件生命周期模型是(49)。
The second kind of learning is called "operant conditioning." This occurs when an individual learns to do things that produce rewards in his environment and learns not to do things that produce punishments. For example, if a mother always attends to her baby when he cries and cuddles him until he is quiet, she may teach him that if he cries he will get attention from mother. Thus, the baby will learn to increase his crying in order to have his mother more.
Every day, we grow and have new experiences. We constantly learn by reading, watching television, interacting with other people, and so forth. This learning affects our emotions. Why is it that we learn to like some people and dislike others？ If a person is nice to us, cares about us, we learn to associate this person with positive feelings, such as joy, happiness, and friendliness. On the other hand, if a person is mean to us, does not care about us, and even deliberately does things to harm us, we learn to associate this person with negative feelings, such as unhappiness, discomfort, and anger.
What's the author's main purpose in writing the passage？
A．That street was further from his destination.B．The road condition there was very bad
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