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The larger a machine and the more numerous its parts. the greater likelihood of a breakdown and the more expensive to repair. What has been said about market forces and management was necessarily oversimplified. The economies of modern industrial nations are large and very complex. To be sure, there is management, and there are market forces at work, but there are also many other factors that help or hinder economic function.
In modern industrial societies' governments play a large role. There is a great amount of regulation, most of it meant for the protection of the public. All regulations affect the way businesses operate, often increasing their costs and reducing their profits. Lower profits, in turn, reduce the amount of money which is known as working capital that a company can use for expansion. Auto emission standards, for instance, have had a significant impact on the manufacture and pricing of automobiles. Other government policies such as taxation, budget deficits, and regulation of the money supply have an effect on how much money is available for people to spend on goods and services.
International crises and other conditions also affect the working of an economy. A severe frost in Brazil can ruin a coffee crop and raise the price of that commodity. War can cut off the supply of such resources as petroleum, chromium, or copper. In the United States environmental protests have slowed the development of nuclear energy capacity and the mining of vast tracts of protected land. Weather affects agriculture, a hot, dry summer can damage the wheat crop; floods can destroy thousands of acres of crops suddenly; and insect pests can devastate cropland with a rapid onslaught.
People's attitudes also have an impact on the marketing of goods. Health-conscious individuals, for example, may stop smoking, curtail their intake of alcohol, and eat less of certain kinds of food. Advertising affects what people buy, and it can create a market where none existed. Style and fashion are significant for many consumers.
There are other economic problems that are more difficult to understand. For centuries economies have been subject to periods of prosperity followed by periods of decline. Although periods of prosperity can be explained rather easily, the reasons for panics, recessions, and depressions are of a complex nature. So many factors contributed to the Great Depression of the 1930s, for example, that no economist has ever been able to account for all of them.
Because the causes of decline are uncertain, the remedies are equally uncertain. In the late 20th century all industrialized societies through their governments have tried to stabilize economies, keep them prosperous, and reduce unemployment. None of the remedies has worked to the extent that was hoped. How economies work and what remedies can be found to keep them operating efficiently are the tasks of economists, who must work together with businessmen and politicians.
21. The chief purpose of the passage is _______.
A. to review the factors that affect economic operation
B. to explore the causes of periodic economic decline
C. to discuss the role governments play in modern industrialized
D. to propose remedies for correcting economic recessions
22. The "machine" in the first sentence of Paragraph 1 is comparable here to _____.
A. the political system of a nation
B. the economy of a nation
C. the market force
D. the government of a nation ,
23. The example of auto emission standards is here used to make it clear that _____.
A. it is harmful for a government to interfere with economic matters
B. state policies tend to lower profits and discourage investment
C. regulation may affect business operation by increasing the cost
D. most regulations are not meant for the protection of the public
24. Why is it difficult to explain the onset of economic decline?
A. Because no economist knows everything.
B. Because it always follows a period of prosperity.
C. Because there are too many reasons behind it.
D. Because it is hard to predict when it will be coming.
25. The author believes that, to find efficient ways of keeping economy going, economists have to ______.
A. find the exact causes for economic decline
B. find ways to fight unemployment
C. work out all the factors that lead to economic prosperity
D. cooperate with businessmen and politicians
Crying is hardly an activity encouraged by society. Tears, be they of sorrow, anger, on joy, typically make Americans feel uncomforuble and embarrassed. The shedder of tears is likely to apologize, even when a devastating (毁灭性的) tragedy was the provocation. The observer of tears is likely to do everything possible to put an end to the emotional outpouring. But judging form recent studies of crying behavior, links between illness and crying and the chemical composition of tears, both those responses to tears are often inappropriate and may even be counterproductive.
Humans are the only animals definitely known to shed emotional tears. Since evolution has given rise to few, if any, purposeless physiological responset, it is logical to assume that crying has one or more functions that enhance survival.
Although some observers have suggested that crying is a way to clicit assistance form others (as a crying baby might from its mother), the shedding of tears is hardly necessary to get help. Vocal cries would have been quite enough, more likely than tears to gain attention, So, it appears, there must be something special about tears themselves.
Indeed, the new studies suggest that emotional tears may play a direct role in alleviating stress, University of Minnesota researchers who are studying the chemical composition of tears have recently isolated two important chemicals from emotional tears. Both chemicals are found only in tears that are shed in response to emotion. Tears shed because of exposure to =cut onion would contain no such substance.
Researchers at several other institutions are investigating the usefulness of tears as a means of diagnosing human ills and monitoring drugs.
At Tulane University’s Teat Analysis Laboratory Dr.Peter Kastl and his colleagues report that they can use tears to detect drug abuse and exposure to medication(药物), to determine whether a contact lens fits properly of why it may be uncomfortable, to study the causes of “dry eye” syndrome and the effects of eye surgery, and perhaps even to measure exposure to environmental pollutants.
At Columbia University Dt.Liasy Faris and colleagues are studying tears for clues to the diagnosis of diseases away from the eyes. Tears can be obtained painlessly without invading the body and only tiny amounts are needed to perform highly refined analyses.
31. It is known from the first paragraph that ________.
A) shedding tears gives unpleasant feelings to American
B) crying may often imitate people or even result in tragedy
C) crying usually wins sympathy from other people
D) one who sheds tears in public will be blamed
32. What does “both those responses to tears”(Line 6, Para, 1) refer to?
A) Crying out of sorrow and shedding tears for happiness.
B) The embarrassment and unpleasant sensation of the observers.
C) The tear shedder’s apology and the observer’s effort to stop the crying.
D) Linking illness with crying and finding the chemical composition of tears.
33. “Counterproductive” (Lines 6-7, Para,1) very probably means “________”.
A) having no effect at all
B) leading to tension
C) producing disastrous impact
D) harmful to health
34. What does the author say about crying?
A) It is a pointless physiological response to the environment.
B) It must have a role to play in man’s survival.
C) It is meant to get attention and assistance.
D) It usually produces the desired effect.
35. What can be inferred from the new studies of tears?
A) Emotional tears have the function of reducing stress.
B) Exposure to excessive medication may increase emotional tears.
C) Emotional tears can give rise to “dry eye” syndrome in some cases.
D) Environmental pollutants can induce the shedding of emotional tears.
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发表于 2016-8-9 08:09:26