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It is high time that you______the problem carefully about what you will do in the future.
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There are no______medicines for Acquired Immune Deficiency Syndrome.
Professor Taiju Matsuzawa wanted to find out why otherwise healthy farmers in northern Japan appeared to be losing their ability to think and reason at a relatively early age, and how the process of ageing could be slowed down.
With a team a colleague (同事) at Tokyo National University, he set about measuring brain volumes of a thousand people of different ages and varying occupations.
" Computer technology enabled the researchers to obtain precise (精确的) measurements of the volume of the front and side sections of the brain, which relate to intellect (智能) and emotion, and determine the human character. " The rear section of the brain, which controls functions like eating and breathing, does not contract with age, and one can continue living without intellectual or emotional facilities.
Contraction of front and side parts—as cells die off—was observed in some subjects in their thirties, but it was still not evident in some sixty- and seventy-year-olds.
Matsuzawa concluded from his tests that there is a simple remedy to the contraction normally associated with age—using the head.
The findings show in general terms that contraction of the brain begins sooner in people in the country than in the towns. Those least at risk, says Matsuzawa, are lawyers, followed by university professors and doctors. White collar workers doing routine work in government offices are, however, as likely to have shrinking brains as the farm workers, bus drivers and shop assistants.
Matsuzawa's findings show that thinking can prevent the brain from shrinking. Blood must circulate properly in the head to supply the fresh oxygen the brain cells need. "The best way to maintain good blood circulation is through using the brain, " he says, "Think hard and engage in conversation. Don't rely on pocket calculators.
The team of doctors wanted to find out______.
How men first learned to invent words is unknown; in other words, the origin of language is a mystery. All we really know is that men, unlike animals, invented certain sounds to express thoughts and feelings, actions and things, so that they could communicate with each other, and later they agreed on certain signs. These signs were called letters, which could be combined to represent those sounds and could be written down. Those sounds, whether spoken or written in letters, are called words.
The power of words, then, exists in their associations—the things they bring up before our minds. Words become filled with meaning for us by experience, and the longer we live, the more certain words remind us of the glad and sad events of our past, and the more we read and learn, the more number of words increases.
Great writers are those who not only have great thoughts but also express these thoughts in words which deeply attract our minds and emotions. This skillful use of words is called "literary style". Above all, a real poet can express his meaning in words which sing like music and can move men to tears. We should, therefore, learn to choose our words carefully and use them properly, or they will make our speech silly and vulgar.
The origin of language is______.
Which of the following can best give the main idea of the second paragraph？
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