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  3. 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 tha

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 tha

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问题      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 the success of mankind.
     Since 1960 a new kind of tool has appeared. This is the silicon chip --a little chip of 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?
In the ancient days, human beings needed to use tools because______.
选项 A、Human beings didn’t have sharp teeth like other meat-eating animals and tools helped them to get food more easily.
B、Tools helped to develop human intelligence.
C、Tools helped the human beings to cut meat and skin from dead animals.
D、It was easy to make stone tools.
答案A
解析 本题为细节题。根据文章第一段，人类之所以使用工具，原因在于人类不具备像其他肉食动物一样利齿，而工具则可以帮助人类更好的获得食物。B项是人类使用工具带来的结果，而不是原因。C项虽是事实，但并不是原因。D项文章没有明确提到。
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