TEXT B Human beings have used tools for a very long time. In some parts of the world you can still find tools that people used more than two million years ago. They made these tools by hitting one stone against another. In this way they broke off pieces from one of the stones. These chips of stone were usually sharp on one side. People used them for cutting meat and skin from dead animals, and also for making other tools out of wood. Human beings needed to use tools because they did not have sharp teeth like other meat-eating animals, such as lions and tigers. Tools helped people to get food more easily. Working with tools also helped to develop human intelligence. The human brain grew bigger, and human beings began to invent more and more tools and machines. The stone chip was one of the first tools that people used, and perhaps it is the most important. Some scientists say that it was the key to success of mankind. Since 1960 a new kind of tool has appeared. This is the silicon chip —— a little chip silicon crystal. It is smaller than a finger-nail, but it can store more than a million "bits" of information. It is an electronic brain. Every year these chips get cleverer, but their size gets smaller, and their cost gets less. They are used in watches, calculators and intelligent machines that we can use in many ways. In the future we will not need to work with tools in the old way. Machines will do everything for us. They will even talk and play games with us. People will have plenty of spare time. But what will they do with it? Human beings used stone chips for more than two million years, but human life changed very little in that time. We have used silicon chips for only a few years, but life is changing faster every day. What will life be like twenty years from now? What will the world be like two million years from now?
　　70. The stone chip is thought to be the most important tool because it _____.
　　A) was one of the first tools
　　B) developed human capabilities
　　C) led to the invention of machines
　　D) was crucial to the development of mankind
　　71. At the end of the passage the author seems to suggest that life in future is _____.
　　A) disastrous
　　B) unpredictable
　　C) exciting
　　D) colorful
　　TEXT C A century ago in the United States, when an individual brought suit against a company, public opinion tended to protect that company. But perhaps this phenomenon was most striking in the case of the railroads. Nearly half of all negligence cases decided through 1896 involved railroads. And the railroads usually won. Most of the cases were decided in sate courts, when the railroads had the climate of the times on their sides. Government supported the railroad industry; the progress railroads represented was not to be slowed down by requiring them often to pay damages to those unlucky enough to be hurt working for them. Court decisions always went against railroad workers. A Mr. Farwell, an engineer, lost his right hand when a switchmans negligence ran his engine off the track. The court reasoned that since Farwell had taken the job of an engineer voluntarily at good pay, he had accepted the risk. Therefore the accident, though avoidable had the switchmen acted carefully, was a "pure accident". In effect a railroad could never be held responsible for injury to one employee caused by the mistake of another. In one case where a Pennsylvania Railroad worker had started a fire at a warehouse and the fire had spread several blocks, causing widespread damage, a jury found the company responsible for all the damage. But the court overturned the jurys decision because it argued that the railroads negligence was the immediate cause of damage only to the nearest buildings. Beyond them the connection was too remote to consider. As the century wore on, public sentiment began to turn against the railroads —— against their economic and political power and high fares as well as against their callousness toward individuals.
　　72. Which of the following is NOT true in Farwell's case?
　　A) Farwell was injured because he negligently ran his engine off the track.
　　B) Farwell would not have been injured if the switchman had been more careful.
　　C) The court argued that the victim had accepted the risk since he had willingly taken his job.
　　D) The court decided that the railroad should not be held responsible.
　　73. What must have happened after the fire case was settled in court?
　　A) The railroad compensated for the damage to the immediate buildings.
　　B) The railroad compensated for all the damage by the fire.
　　C) The railroad paid nothing for the damaged building.
　　D) The railroad worker paid for the property damage himself.
　　74. The following aroused public resentment EXCEPT _____.
　　A) political power
　　B) high fares
　　C) economic loss
　　D) indifference
　　75. What does the passage mainly discuss?
　　A) Railroad oppressing individuals in the US.
　　B) History of the US railroads.
　　C) Railroad workers' working rights.
　　D) Law cases concerning the railroads.