单选题Which of the following does the author use most to convince readers of the FBI s new method?

单选题Which sport is supposed to be America's national sport and used to be call "American's favorable pastime"? A. Baseball. B. Basketball. C. Rugby. D. Cricket.

单选题 Prices determine how resources are to be used. They are also the means by which products and services that are in limited supply are rationed among buyers. The price system of the United States is a very complex network composed of the prices of all the products bought and sold in the economy as well as those of a myriad of services, including labor, professional, transportation, and public-utility services. The interrelationships of all these prices make up the "system" of prices. The price of any particular product or service is linked to a broad, complicated system of prices in which everything seems to depend more or less upon everything else. If one were to ask a group of randomly selected individuals to define "price", many would reply that price is an amount of money paid by the buyer to the seller of a product or service or, in other words, that price is the money value of a product or service as agreed upon in a market transaction. This definition is, of course, valid as far as it goes. For a complete understanding of a price in any particular transaction, much more than the amount of money involved must be known. Both the buyer and the seller should be familiar with not only the money amount, but with the amount and quality of the product or service to be exchanged, the time and place at which the exchange will take place and payment will be made, the form of money to be used, the credit terms and discounts that apply to the transaction, guarantees on the product or service, delivery terms, return privilege, and other factors. In other words, both buyer and seller should be fully aware of all the factors that comprise the total "package" being exchanged for the asked-for amount of money in group that {{U}}they{{/U}} may evaluate a given price.

单选题Questions 14-16 are based on the following dialogue. You now have 15 seconds to read Questions 14-16.

单选题Although the size of the workforce depends a great deal on the size of the total population, there are several other influences which also affect it. The age distribution of the total population has a very 1 effect on the available workforce. If the population has a high 2 of very young people or of 3 too old to work, then the available workforce would be lower than 4 there were an 5 spread age distribution. If the population grows raidly 6 natural increase, i.e., the number of births greatly 7 the number of deaths, then as a total population increases the proportion of the workforce 8 . Sometimes a population is described as aging, 9 means that the birth rate is either falling or growing very slowly, and as people retire 10 the workforce there are insufficient numbers of young people entering it to 11 those who are leaving it. The population is top heavy with older people. So the 12 of the population in the workforce declines when there is 13 a rapid increase in births or a falling birth rate. The age distribution of the population has several important effects on the economy. If the population is aging and there is an increase in the number of people retiring 14 a corresponding increase in the number entering the workforce, this raises the problem of the ability of the economy to provide a 15 level of social services to the retired group. If the 16 are to be cared 17 in special homes or hotels, finance must be 18 for that purpose. If the size of the workforce is small relative 19 the total population, then the government tax receipts are relatively low and either the government has less money available to it or the workforce members have to be 20 more heavily.

单选题 Taking a nap is frowned upon by many people and is viewed as fondness for the elderly and children. Mention nap and you could be seen as lazy, depressed and unwilling to work. However, taking a nap is one of the best but most underused tools for busy people to ease weariness. The majority of people experience drowsiness in the afternoon and notice their work efficiency and mood starting to slip and taking a nap will help combat this. The results of research suggest that taking a nap can make you more alert, reduce stress and improve cognitive function compared to those who working all day without rest. A mid-afternoon nap means that productivity can last long into the night. Researchers at NASA found that a 30- minute full nap increased cognitive function by 40%. The volunteers on the tests found that their memory improved as well as experiencing an increase in concentration. Those who didn't nap would score lower on IQ test than those who did (after a day of work). If you feel tired in the afternoon and from then on can't perform at your best, t recommend taking a short power nap to get yourself feel alert and ready for work. You will notice your mood and alertness to be improved. ! advise keeping the nap between 15 and 30 minutes if you want to avoid getting into deeper stages of sleep. If you do, you'll find it harder to wake and may experience the unstable feeling for a while. For those who are worried about the after-affect of a nap, there is the caffeine nap. A caffeine nap is taken after an intake of caffeine, so that you are asleep while your body digests the caffeine. After a 15 -30 minutes nap, you wake up and have the caffeine in your system. This is great if you need to be instantly on the move after a nap, and you can bounce out of your sleeping state and jump into refreshed Work feeling. Finding 15 -30 minutes to take a nap in a day sometimes seems difficult, but doing so is very helpful to your productivity. Even 10 minutes of a nap every day will be better than nothing at all, and may give you the energy you need to be successful. If you're willing to have a try, make sure you can find a comfortable place before setting your head down. If you can feel secure and let go, then your rest will be even more beneficial.

单选题The only remaining 18% of Costa Rican lowland forests in the early 1990s led to ______.

单选题A Frenchman went to stay at the best hotel in a small Italian town with his wife. One night, he went out for a walk alone. The small street was dark and quiet. Suddenly he felt someone behind him. He turned his head and saw an Italian young man who quickly walked past him. The man was nearly out of sight (看不见了) when the Frenchman suddenly found that his watch was gone. He thought that it must be the Italian who had taken his watch. He decided to follow him and get back the watch. Soon the Frenchman caught up with the Italian. Neither of them understood the other' s language. The Frenchman frightened the Italian with his fist (拳头) and pointed at the Italian' s watch. In the end the Italian took off his watch and gave it to the Frenchman. When he returned to the hotel, the Frenchman told his wife what had happened. He was greatly surprised when his wife pointed to the watch on the table. Now he realized (意识到) that by mistake he had robbed (抢劫) the watch and it was the Italian' s.

单选题In 1921, the British signed ______, establishing an Irish Free State with dominion status. [A] the Act of Union [B] the Anglo-Irish Treaty [C] Downing Street Declaration [D] the Anglo-Irish Agreement

单选题Facing the tepid returns in recent years, investors______.

单选题From paragraph 1, we can learn that ______.

单选题______ he is running! [A]What quickly [B]How quick [C]How quickly