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从运作上看,回购交易结合了现货交易和()的特点。
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任何经济业务的发生都不会破坏会计等式的平衡关系。 ()
Yellow, a bright, sunny color, often makes people feel happy and more active. Yet it makes some people feel hot and restless. Red often makes people feel energetic. But not everyone feels good wearing red.
If some colors can make us feel better, might certain colors also help us think better？ According to a 3year study in Germany, the answer seems to be yes. Scientists studied how various colors affect school children. And they found that certain colors could raise I. Q. as much as 12 points. In the experiment, rooms with low ceilings were painted in different colors. The more popular colors were light blue, yellow, yellow-green, and orange. Less popular colors such as white, black, and brown caused a drop in I. Q. The study found that the color orange in particular improved social behavior, cheered up children's spirits and made them feel less hostile and irritable.
Do people's color preferences tell us anything about their personalities？ Some researchers think they do. According to these researchers, people who are more out-going usually prefer "warm" colors. People who are quieter, less people-oriented, often prefer "cool" colors.
If you live in a room painted light blue, you may feel________.
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______.
丘是指地表上一块有界空间的地块,一个地块只属于一个产权单元时称为(),一个地块属于几个产权单位时称为()。
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