大学英语自学教程（下）电子版

Congress. Each state thus gets two electoral votes for its Senate representation and a varying number of electoral votes depending on its House representation. Altogether, there are 538 electoral votes (including three for the District of Columbia, even though it has no voting representatives in Congress). To win the presidency, a candidate must receive at least 270 votes, an electoral majority.

Candidates are particularly concerned with winning the states which have the largest population, such as California (with 54 electoral votes), New York (33), Texas (32), Florida (25), Pennsylvania (23), lllinois (22), and Ohio (21). Victory in the eleven largest states alone would provide an electoral majority, and presidential candidates therefore spend most of their time campaigning in those states. Clinton received only 43 percent of the popular vote in 1992, compared with Bush's 38 percent and Perot's 19 percent; but Clinton won in states that gave him an overwhelming 370 electoral votes, compared with 168 for Bush and none for Perot.

10-B. The American Two-party System

No one now living in the United States can remember when the contest began between the Democratic and the Republican parties. It has been going on for more than a century, making it one of the oldest political rivalries in the world.

The American political system is a classical example of the two-party system. When we say that we have a two-party system in the United States we do not mean that we have only two parties. Usually about;i dozen parties nominate presidential candidates. We call it a two-party system because we have two large parties and a number of small parties, and the large parties are so large that we often forget about the rest. Usually the small parties collectively poll less than 5 per cent of the vote cast in national elections.

The Democratic and Republican parties are the largest and most competitive organizations in the American community. They organize the electorate very simply by maintaining the two-party system. Americans almost inevitably become Democrats or Republicans because there is usually no other place for them to go. Moreover, because the rivalry of these parties is very old, most Americans know where they belong in the system. As a consequence of the dominance of the major parties, most elected officials are either Republicans or Democrats. Attempts to break up this old system have been made in every presidential election in the past one hundred years, but thesystem has survived all assaults.

How does it happen that the two-party system is so strongly rooted in American politics? The explanation is probably to be found in the way elections are conducted. In the United States, unlike countries with a parliamentary system of government, we elect not only the President, but a large number of other officials, about 800,000 of them. We also elect congressmen from single-member districts. For example, we elect 435 members of the House of Representatives from 435 districts (there are a few exceptions), one member for each district. Statistically, this

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大学英语自学教程（下）电子版

kind of election favors the major parties. The system of elections makes it easy for the major parties to maintain their dominant position, because they are likely to win more than their share of the offices.

One of the great consequences of the system is that it produces majorities automatically. Because there are only two competitors in the running, it is almost inevitable that one will receive a majority. Moreover, the system tends slightly to exaggerate the victory of the winning party. This is not always true, but the strong tendency to produce majorities is built into the system. In over 200 years of constitutional history, Americans have learned much about the way in which the system can be managed so as to make possible the peaceful transfer of power from one party to the other. At the level of presidential elections, the party in power has been overturned by the party out of power nineteen times, almost once a decade. In the election of 1860, the political system broke down, and the Civil War, the worst disaster in American history, resulted. Our history justifies our confidence in the system hut also shows that it is not foolproof.

The second major party is able to survive a defeat because the statistical tendency that exaggerates the victory of the winning party operates even more strongly in favor of the second party against the third, fourth, and fifth parties. As a result, the defeated major party is able to maintain a monopoly of the opposition. The advantage of the second party over the third is so great that it is the only party that is likely to he able to overturn the party in power. It is able, therefore, to attract the support of everyone seriously opposed to the party in power. The second party is important as long as it can monopolize the movement to overthrow the party in power, because it is certain to come into power sooner or later.

Another consequence of the two-party system is that whereas minor parties are likely to identify themselves with special interests or special programs and thus take extreme positions, the major parties are so large that they tend to be moderate. Evidence of the moderation of the major parties is that much business is conducted across party lines. What happens when the Democrats control one house of Congress and the Republicans control the other? About the same volume of legislation is passed as when one party controls both houses, although some important legislation is likely to be blocked temporarily. It is possible to carry on the work of the government even when party control is divided because party differences are not fundamental.

11-A. Sacrificed to Science?

Professor Colin Blakemore works at Oxford University Medical School doing research into eye problems and believes that animal research has given humans many benefits:

The use of animals has been central to the development of anaesthetics, vaccines and treatments for diabetes, cancer, developmental disorders...most of the major medical advances have been based on a background of animal research and development.

There are those who think the tests are simply unnecessary. The International Association Against Painful Experiments on Animals is an organization that promotes the use of alternative

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大学英语自学教程（下）电子版

methods of research which do not make animals suffer. Their spokesman Colin Smith says:

Animal research is irrelevant to our health and it can often produce misleading results. People and animals are different in their reactions to drugs and in the way their bodies work. We only have to look at some of the medical mistakes to see this is so. But Professor Blackmore stresses:

It would be completely irresponsible and unethical to use drugs on people that had not been thoroughly tested on animals. The famous example of thalidomide is a case for more animal testing, not less. The birth defects that the drug produced were a result of inadequate testing. If thalidomide were invented today, it would never be released for human use because new tests on pregnant animals would reveal the dangers.

Another organization that is developing other methods of research is FRAME. This is the Fund for the Replacement of Animals in Medical Experiments. It recognises that many experiments still have to be done on animals and is aiming for Reduction, Refinement and Replacement of animals in experiments. In 1981, it established a research programme to improve and expand non-animal testing. Increasingly, new technology is making it easier for us to find alternative methods of testing. Computer models can be used to simulate the way that cells work and to try to predict the toxicity of chemicals. Data from previous animal experiments is used to develop a computer model which will predict what will happen if you add a chemical with an unknown biological effect to a substance. The eventual aim of computer modeling is to reduce the number of animals used in experiments.

The Lethal Dose 50 test (LD50) may also be replaced. In the original test, all the animals in a test group are given a substance until half of them die. The test indicates toxicity. A method using a fixed amount, which gives the same eventual information but uses fewer animals and does not require that they die, may replace the LD50. Many other new techniques are now available that enable more research to be done in the test tube to see if chemicals produce harmful biological effects. The number of animals used in laboratory tests has declined over the last 20 years. This is partly due to alternatives and partly to the fact that experiments are better designed so fewer need to be used -- healthier animals provide better experimental results. For example, it used to take 36 monkeys to test a sample of polio vaccine, now it takes only 22. Also, lack of money has reduced the number of animals used --they are expensive to buy and expensive to keep.

Birmingham University now has Britain’s first department of Biomedical Ethics. Professor David Morton of the department is involved in animal research and is concerned with reducing animal suffering as much as possible. Animals spend 95% of their time in their cages and refinement also means making their lives better when not undergoing tests. This includes keeping them in more suitable cages, allowing social animals like dogs to live together and trying to reduce the boredom that these animals can experience.

In Professor Morton’s laboratory, rabbits live together in large runs, filled with deep litter and

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boxes that they can hide in. The researchers have also refined some experiments. In the US, one experiment in nerve regeneration involves cutting a big nerve in a rat’s leg, leaving its leg paralysed. In Morton’s lab, the researcher cuts a small nerve in the foot. He can see if it can regrow and the rat can still run around its cage.

Even with these new developments in research, only a tiny proportion of all tests are done without using animals at some stage. The use of animals in experiments cannot stop immediately if medical research is to continue and consumer products are to he properly tested, and Professor Blakemore believes that sometimes there are no alternatives:

Wherever possible, for both ethical and scientific reasons, we do not use animals. But cells live in animals and we can only really see how they behave when they are inside animals. We cannot possibly reproduce in a test tube or a computer model all the complex reactions of the body to a drug or a disease. When it comes to research into heart disease and its effects on the body, or diseases of the brain for example, we do not have adequate substitutes for the use of animals. As research techniques become more advanced, the number of animals used in experiments may decrease, but stopping testing oil animals altogether is a long way away.

11-B. Let's Stop Keeping Pets

Pets are lovable, frequently delightful. The dog and the cat, the most favored of pets, are beautiful, intelligent animals. To assume the care for them can help bring out the humanity in our children and even in us. A dog or a cat can teach us a lot about human nature; they are a lot more like us than some might think. More than one owner of a dog has said that the animal understands everything he says to it. So a mother and father who have ever cared for pets are likely to be more patient and understanding with their children as well, and especially to avoid making negative or rude remarks in the presence of a child, no matter how young.

It is touching to see how a cat or dog -- especially a dog -- attaches itself to a family and wants to share in all its goings and comings. If certain animal psychologists are right, a dog adopts his family in a most literal way - taking it for granted that the family is the band of dogs he belongs to.

It is sometimes said that the cat \ing.” But is that really true? A cat can teach us a valuable lesson about how to be contented, how to be serene and at ease, how to sit and contemplate. Whereas a dog's constant pleas for attention become, sometimes, a bit too much. Nevertheless it is the dog who can teach us lessons of loyalty and devotion that no cat ever knew.

So there's plenty to be said in favor of keeping pets. But with all that in mind, I still say let's stop keeping pets. Not that a family should kill its pets. Very few could bring themselves to do that. To be practical, I am suggesting that if we do not now have a pet we should not acquire one;

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