题目内容
One important new use for computers is for entertainment. Many new games have been designed to be played, on the computers. People of all ages have been playing these games. They have been going to Arcades where the computer games can be played for a small cost. People also have been buying home computers ,to play computer games at home. They have become very popular indeed.
Computers in the United States ______.
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Five hundred years ago, news of important happenings--battles lost and won, kings or rulers overthrown 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 e vents that occur in faraway countries on the same day they happen.
Apart from supplying news from all over the world, newspapers give us a lot of other useful in formation. There are weather reports, radio, television and film guides, book reviews, stories, and, of course, advertisements. There are all sorts of advertisements. The bigger ones are put in by large companies to bring attention to their products. They pay the newspapers thousands of dollars for their 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 important. Money earned from advertisements makes it possible for them to sell their newspapers at a low price and still make a profit.
The habit of reading newspapers is ______.
Public goods are those commodities from whose enjoyment nobody can be effectively excluded. Everybody is free to enjoy the benefits of these commodities, and one person' s utilization does not reduce the possibilities of anybody else' s enjoying the same good.
Examples of public goods are not as rare as one might expect. A flood control dam is a public good. Once the dam is built, all persons living in the area will benefit--irrespective of their own contribution to the construction cost of the dam. The same holds true for highway signs or aids to navigation. Once a lighthouse is built, no ship of any nationality can be effectively excluded from the utilization of the lighthouse for navigational purposes. National defense is another example. Even a person who voted against military expenditures or did not pay any taxes will benefit from the protection afforded.
It is no easy task to determine the social costs and social benefits associated with a public good. There is no practicable way of charging drivers for looking at highway signs, sailors for watching a lighthouse, and citizens for the security provided to them through national defense: Because the market does not provide the necessary signals, economic analysis has to be substituted for the impersonal judgement of the marketplace.
With what topic is the passage mainly concerned？
When a teacher or lecturer recommends a student to read a book, it is usually for a particular purpose. In many eases, the teacher doesn' t suggest that the whole book should be read. In fact, he may just refer to a few pages which have a direct bearing on the matter being discussed.
Unfortunately, when many students pick up a book to read they tend to have no particular purpose in mind other than simply to "read the book". Often they open the book and start reading, page by page, line by line, word by word; in other words, slowly and in great detail. The result is that students frequently don' t have an overall view of what they are reading; also, they tend to forget fairly soon what they' ye been reading.
Students can make their reading much more effective by adopting a strategy (策略) aimed at helping them to understand and to remember what they read. Firstly, they should decide precisely why they' re reading the book: perhaps it' s to find some information that'll answer a question; per haps it' s to understand a difficult idea or argument, and so on. Then the students should decide exactly what they are going to read; it' s seldom necessary to read the whole book. A good starting point is the contents page, the chapter headings, and even the index (索引) at the back of the book. They are very useful in helping to pinpoint the exact pages that need to be read carefully for particular pieces of information.
According to the passage, it is rare for a teacher ______.
When his master is moved to travel, the dog has to be on hand to help pull whatever load is put on the sledge(雪撬), and often such loads are very heavy. The Eskimo dog in his region is tough, savage, quarrelsome animal with a hairtrigger(一触即发的) temper. On his home ground he re quires stern handling--and he gets it.
An Eskimo uses his whip ______.
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