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Why is the woman going to give up swimming？
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【C15】
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. Obviously, computers have no reason to steal money. But they also have no conscience, 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 witnesses 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 City 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 on 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 company'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 really know how a computer works. "
The passage is mainly about
Before the nineteenth century, scientists with ah interest in the sea were few and far between. Certainly Newton considered some theoretical aspects of it in his writings, but he was reluctant to go to sea to further his work.
For most people the sea was remote, and with the exception of early intercontinental travelers or others, who earned a living from the sea them was little reason to ask many questions about it, let alone to ask what lay beneath the surface. The first time that the question what is at the bottom of the oceans had to be answered with any commercial consequence was when the laying of a telegraph cable from Europe to America was proposed. The engineers had to know the depth profile of the route to estimate the length of cable that had to be manufactured.
It was to Maury of the U. S. Navy that the Atlantic Telegraph Company turned, in 1855, for information on this matter. In the 1840s, Maury had been responsible for encouraging voyages during which soundings were taken to investigate the depths of the North Atlantic and Pacific Oceans. Later, some of his findings aroused much popular interest in his book The Physical Geography of the Sea.
The cable was laid, but not until 1866 was the connection made permanent and reliable. At the early attempts, the cable failed and when it was taken out for repairs it was found to be covered by living growths, a fact which defied contemporary scientific opinion that there was no life in the deeper parts of the sea.
Within a few years Oceanography was under way. In 1872, Thomson led a scientific expedition, which lasted for four years and brought home thousands of samples from the sea. Their classification and analysis occupied scientists for years and led to a five volume report, the last volume being published in 1895.
The passage implies that the telegraph cable was built mainly ______.
What are the students doing when the man arrives in class？
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