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

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第五段第二、第三句指出，几百年来，经济起落不定，虽然可以相当容易地解释繁荣阶段的来临，但对于经济恐慌、衰退和萧条的解释却是个复杂的问题。例如：导致30年代大萧条的因素是如此之多．以至于哪位经济学家都不能解释所有因素。最后一段第一句又指出，因为衰退的原因难以确定，应对策略也同样难以制定，因此，选项C符合题意。

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1
The author believes that, to find efficient ways of keeping economy going, economistshave 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

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2
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Disagreements among economists are legendary, but not on the issue of free trade．A recentsurvey of prominent economists both conservative and liberal concluded that an economist who ar-gues for restricting international trade is almost as common today as a physician who favors leech-ing.
Why the consensus?International free trade, economists agree, makes possible higher stan-
dards of living all over the globe.
The case for free trade rests largely on this principle: as long as trade is voluntary, both part-ners benefit, otherwise they wouldn't trade．The buyer of a shirt, for example, values the shirtmore than the money spent, while the seller values the money more．Both are better off because ofthe sale．Moreover, it doesn't matter whether the shirt salesman is from the United States or HongKong (or anywhere else).
The vast majority of American manufactures face international competition．This competitionforces companies to improve quality and cut costs．By contrast,protectionism encouragesmonopoly, lower quality and higher prices.
Americans pay an enormous price for protectionism over $60 billion a year, or $1000 for afamily of four．Thanks to protectionism, for example, American consumers pay twice the worldprice for sugar.
Free trade also makes the world economy more efficient, by allowing nations to capitalize ontheir strengths．The United States has an advantage in food production, for instance, while SaudiArabia has an advantage in oil．The Saudis could undertake massive irrigation to become self-suf-ficient in food, but it is more economical for them to sell oil and purchase food from us．Similarly,
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Protectionism is both wasteful and unjust．It taxes most heavily the people who can least affordit．Thus, tariffs that raise the price of shoes burden the poor more than .the rich．Despite the pow-erful case for free trade, the United States and the rest of the world have always been protectionistto some degree．This is because free trade benefits the general public, while protectionism benefitsspecial interest groups, which are better organized, better financed and more informed．To makematters worse, much of what we hear on this issue is misinformation spread by the special intereststhemselves.
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A．agree on the restriction of internal trade

B．disagree whether to restrict free trade or not

C．hold different arguments because of their different interests

D．agree on free trade.

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3
What is the author's attitude toward protectionism denoted from the fifth paragraph? __________

A．Ironic

B．Sincere

C．Gratefu．

D．Appreciative

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