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在指数平滑法的应用中,观测值呈较稳定的水平发展,此时α的值为（)。
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y＝（tan x)sin x；
Approaches to Understanding Intelligences
It pays to be smart, but we are not all smart in the same way. You may be a talented musician, but you might not be a good reader. Each of us is different. Psychologists disagree about what is intelligence and what are talents or personal abilities. Psychologists have two different views on intelligence. Some believe there is one general intelligence. Others believe there are many different intelligences.
Some psychologists say there is one type of intelligence that can be measured with IQ tests.
These psychologists support their view with research that concludes that people who do well on one kind of test for mental ability do well on other tests. They do well on tests using words, numbers or pictures. They do well on individual or group tests, and written or oral tests. Those who do poorly on one test, do the same on all tests.
Studies of the brain show that there is a biological basis for general intelligence. The brain of intelligent people use less energy during problem solving. The brain waves of people with higher intelligence show a quicker reaction. Some researchers conclude that differences in intelligence result from differences in the speed and effectiveness of information processing by the brain.
Howard Gardner, a psychologist at the Harvard School of Education, has four children. He believes that all children are different and shouldn&39;t be tested by one intelligence test. Although Gardner believes general intelligence exists, he doesn&39;t think it tells much about the talents of a person outside of formal schooling. He thinks that the human mind has different intelligences.
These intelligences allow us to solve the kinds of problems we are presented with in life. Each of us has different abilities within these intelligences. Gardner believes that the purpose of school should be to encourage development of all of our intelligences.
Gardner says that his theory is based on biology. For example, when one .part of the brain is injured, other parts of the brain still work. People who cannot talk because of brain damage can still sing. So, there is not just one intelligence to lose. Gardner has identified 8 different kinds of intelligence: linguistic, mathematical, spatial, musical, interpersonal, intrapersonal, body-kinesthetic(身体动觉的), and naturalistic.
What is the main idea of this passage？ 查看材料
设向量组α1，α2，…αt是齐次方程组Ax＝0的一个基础解系，向量β不是方程组Ax＝0的解，即Aβ≠0．试证明：向量组β，β＋α1，β＋α2，…，β＋α1，线性无关．
Cell Phones: Hang Up or Keep Talking？
Millions of people are using cell phones today. In many places it is actually considered unusual not to use one. In many countries, cell phones are very popular with young people. They find that the phones are more than a means of communication--having a mobile phone shows that they are cool and connected.
The explosions around the world in mobile phone use make some health professionals worded.
Some doctors are concerned that in the future many people may suffer health problems from the use of mobile phones. In England, there has been a serious debate about this issue. Mobile phone companies are worded about the negative publicity of such ideas. They say that there is no proof that mobile phones are bad for your health.
On the other hand, why do some medical studies show changes in the brain cells of some who use mobile phones？ Signs of change in the tissues of the brain and head can be deteeted with modern scanning (扫描) equipment. In one case, a traveling salesman had to retire at a young age because of serious memory loss. He couldn&39;t remember even simple tasks. He would often forget the name of his own son. This man used to talk on his mobile phone for about six hours a day, every day of his working week, for a couple of years. His family doctor blamed his mobile phone use, but his employer&39;s doctor didn&39;t agree.
What is it that makes mobile phones potentially harmful？ The answer is radiation. High-tech machines can detect very small amounts of radiation from mobile phones. Mobile phone companies agree that there is some radiation, but they say the amount is too small to worry about.
As the discussion about their safety continues, it appears that it&39;s best to use mobile phones less often. Use your regular phone if you want to talk for a long time. Use your mobile phone only when you really need it. Mobile phones can be very useful and convenient, especially in emergencies. In the future, mobile phones may have a warning label that says they are bad for your health. So for now, it&39;s wise not to use your mobile phone too often.
People buy cell phones for the following reasons EXCEPT that__________. 查看材料
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