The only way to really learn a word is to use it, and that counts for spelling as much as for learning its meaning. You’re trying to build up the motor memory of writing it correctly spelled.į. Let others read your writings, and ask them to circle misspelled words.Į. Those of us who spell well have a hard time explaining it, too.ĭ. Put a mark next to every word you look up in the dictionary.Ĭ. There is no substitute( 代替 ) for reading a lot.ī. 【 5 】 Write a blog, a journal, e-mails, a novel, anything that will keep you using words and pay special attention as you write to the words that come up wrong.Ī. Write! Write! Write! 【 4 】 When you look it up how to spell a word, write it down several times in a row and do it again a day or two later. 【 3 】 If you look it up more than once, add it to your personal list. 【 2 】 When you get a chance, look it up and put the correct spelling next to it. Make a list of your commonly misspelled words. Spelling is not about how a word sound, it’s about how it looks on the page, which means you have to look at a lot of words on the page to learn the correct spelling about it. 【题目】 How do you improve your spelling? 【 1 】 Just as we learn spoken language by hearing lots of people speaking, we learn written language, including spelling, by reading what a lot of people write. compare the demographic growth pattern in the past with that after 1650 present us a brief and clear picture of the demographic growthĭ. find out the cause of rapid increase in population in recent yearsĬ. warn people against the population explosion in the near futureī. 【4】 The author of the passage intends to. it was too dangerous to have babies due to the poor conditions there was higher mortality than fertility in most placesĭ. our ancestors had little enthusiasm for more childrenĬ. only one in ten persons could live past 40.ī. 【3】 During the first period of demographic history, societies were often in danger of extinction because. A long period when death rates exceed birthrates and then a short period with higher fertility and lower A virtually stable or slightly decreasing period and then a sudden explosion of population.ĭ. Too many people on earth and a few rapid increases in the number added each year.Ĭ. A slow growth for a long time and then a period of rapid, dramatic increase.ī. 【2】 Which of the following demographic growth patterns is most similar to the long thin powder fuse?Ī. 【1】 The underlined word "demographic" in Paragraph l means. The increase is about 800000,000 persons annually. and 1650, an average of only 50,000 persons was being added annually to the world's population, At present, this number is added every six hours. And the population reached 6.2 billion throughout the world by the year 2000, One way to appreciate this dramatic difference in such abstract numbers is to reduce the time frame to something that is more manageable. Between 16, the population has increased from 500 million to more than 4 billion. In the first period of some 9,600 years, the population increased from some 8 million to 500 million in 1650. Not only does it put the current problems of demographic growth into a historical perspective, but it suggests that the cause of rapid increase in population in recent years is not a suddenĮnthusiasm for more children, but an improvement in the conditions that traditionally have caused high mortality.ĭemographic history can be divided into two major periods: a time of long, slow growth which extended from about 8000 B.C. Thus, the population problem throughout most of history was how to prevent extinction of the human race. Often, societies were in clear danger of extinction because death rates could exceed their birthrates. For most of human history, it was seldom the case that one in ten persons would live past forty, while infancy and childhood were especially risky periods. There was high fertility( 生育 )in most places, but this was usually balanced by high mortality. For most of our ancestors, life was hard, often nasty, and very short. Looking back at the 8,000 years of demographic history, we find that populations have been virtually stable or growing very slightly for most of human history. Rapid growth is a comparatively recent phenomenon. To understand the current situation, which is characterized by rapid increases in population, it is necessary to understand the history of population trends. It was quite right to compare demographic growth to "a long, thin powder fuse( 导火线 )that bums steadily and hesitatingly until it finally reaches the charge and explodes". Though the facts that too many people on earth and a too rapid increase in the number added each year are not in argument, we always begin the discussion of "population as global issue" with what most persons mean like this.
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