题目内容

在中学物理教学中，教师要求学生从推动力、绳长和摆锤重量三个因素中找出影响单摆振动频率的因素。学生可以通过假定某两个因素保持恒定、依次改变第三个因素来看单摆振动频率的变化，借此找出问题的答案。而小学生往往会同时改变两个变量寻求解决方案，其结果是无法找出影响单摆振动频率的因素。请根据皮亚杰的思维发展阶段理论分析；该阶段的主要思维发展什么特征是什么？

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Questions 56 to 63 are based on the following passage. In many businesses, computers have largely replaced paperwork, because they are fast, flexible, and do not make mistakes. As one banker said, “Unlike humans, computers never have a bad day.” And they are honest. Many banks advertise that their transactions are “untouched by human hands” and therefore safe from human temptation （诱惑）. Obviously, computers have no reason to steal money. But they also have no conscience （良知）, and the growing number of computer crimes shows they can be used to steal. Computer criminals don’t use guns. And even if they are caught, it is hard to punish them because there are no witness and often no evidence. A computer cannot remember who used it: it simply does what it is told. The head teller at a New York bank used a computer to steal more than one and a half billion dollars in just four years. No one noticed this theft because he moved the money from one account to another. Each time a customer he had robbed questioned the balance in his account, the teller claimed a computer error, then replaced the missing money from someone else’s account. This man was caught only because he was a gambler. When the police broke up an illegal gambling operation, his name was in the records. Some employees use the computer’s power to get revenge （报复） on their employers they consider unfair. Recently, a large insurance company fired its computer-tape librarian for reasons that involved her personal rather than her professional life. She was given thirty days notice. In those thirty days, she erased all the firm’s computerized records. Most computer criminals have been minor employees. Now police wonder if this is “the tip of the iceberg”. As one official says, “I have the feeling that there is more crime out there than we are catching. What we are seeing now is all so poorly done. I wonder what the real experts are doing — the ones who know how a computer works.” Questions: Sometimes an unfairly-treated employee can use the computer to ________ on his employer.