题目内容
What's more, the great part of the growth—9 of every 10—added to the earth's population—will be in the poor and undeveloped countries. These are the nations where providing enough food for billions of people already is proving to be a headaching problem.
By the year 2000, today's "have not" nations will have a total population of 5 billion people, nearly four-fifths of the world's population.
Food isn't the only problem that such a population explosion presents. The more people there are and the worse their living conditions, the greater grow the possibility of all kinds of social problems.
In 1830, world population reached 1 billion. It took only 100 more years to add another billion to world population, just 30 more to add a third billion. And it took just 15 more years to reach the 4 billion mark in 1975.
Actually, the world's birth rate is falling. But so is death rate, as medical advances have made it possible for man to live longer than before. Such advances have also reduced baby death rate. Unless population growth is reduced, the world population may reach 12 billion in a century. Is the earth capable of providing a good life for so large a population？
A population explosion will lead to______.
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According to Paragraph 2, research surveys have proved that______.
______, the world may have a population of 12 billion in a century.
Almost every family buys at least one copy of a newspaper every day. Some people subscribe(订阅) to as many as two or three newspapers. But why do people read newspapers？
Five hundred years ago, news of important happenings—battles lost and won, kings or rulers overthrown(推翻) or killed—took months and even years to travel from one country to another. The news passed by word of mouth and was never accurate. Today we can read in our newspapers of important events that occur in far away countries on the same day they happen.
Apart from supplying news from all over the world, newspapers give us a lot of other useful information. There are weather reports, radio, television and film guides, book reviews, stories and, of course, advertisements. The bigger ones are put in by large companies to bring attention to their products. They pay the newspapers thousands of dollars for the advertising space, but it is worth the money, for news of their products goes into almost every home in the country. For those who produce newspapers, advertisements are also very important. Money earned from advertisements makes it possible for them to sell their newspapers at a low price and still make a profit.
Newspapers often have information on gardening, cooking and fashion, as well as a small but very popular section on jokes and cartoons(漫画) .
The habit of reading newspapers is______.
During the hours when you labor through your work you may say that you're "hot." That's tree. The time of day when you feel most energetic is when your cycle of body temperature is at its peak. For some people the peak. comes during the forenoon. For others it comes in the afternoon or evening. No one has discovered why this is so, but it leads to such familiar monologues (自言自语) as: "Get up, John! You'll be late for work again!" The possible explanation to the trouble is that John is at his temperature-and-energy peak in the evening. Much family quarrelling ends when husbands and wives realize what these energy cycles mean, and which cycle each member of the family has.
You can't change your energy cycle, but you can learn to make your life fit it better. Habit can help, Dr. Kleitman believes. Maybe you're sleepy in the evening but feel you must stay up late anyway. Counteract (对抗) your cycle to some extent by habitually staying up later than you want to. If your energy is low in the morning but you have an important job to do early in day, rise before your usual hour. This won' t change your cycle, but you'll get up steam (鼓起干劲) and work better at your low point.
Get off to a slow start which saves your energy. Get up with a leisurely yawn and stretch. Sit on the edge of the bed a minute before petting your feet on the floor. Avoid the troublesome search for clean clothes by laying them out the night before. Whenever possible, do routine work in the afternoon and save tasks requiring more energy or concentration for your sharper hours.
If a person finds getting up early a problem, most probably ______.
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