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Questions 76-80 refer to the following information.
Disagreements among economists are legendary, but not on the issue of free trade. A recent survey of prominent economists both conservative and liberal concluded that an economist who argues for restricting international trade is almost as common today as a physician who favors leeching.
Why the International free trade, economists agree,, makes possible higher standards of living all over the globe.
The case for free trade rests largely on this principle: as long as trade is voluntary, both partners’ benefits, otherwise they wouldn't trade. The buyer of a shirt, for example, values the shirt more than the money spend, while the seller values the money more. Both are better off because of the sale. Moreover, it doesn’t matter whether the shirt salesman is from the United States or Hong Kong （or anywhere else）.
The vast majority of American manufactures face international competition. This competition forces companies to improve quality and cut costs. By contrast, protectionism encourages monopoly, lower quality and higher prices.
Americans pay an enormous price for protection over $60 billion a year, or $1000 for a family of four. Thanks to protectionism, for example, American consumers pay twice the world price for sugar.
Free trade also makes the world economy more efficient, by allowing nations to capitalize on their strengths. The United States has an advantage in food production, for instance, while Saudi Arabia has an advantage in oil. The Saudis could undertake massive irrigation to become self-sufficient in food, but it is more economical for them to sell oil and purchase food from us. Similarly, we could become self-sufficient in petroleum by squeezing more out of oil shale. But it is much less costly to buy some of our oil from Saudi Arabia. Tarde between our two countries improves the standard of living in both.
Protectionism is both wasteful and unjust. It taxes most heavily the people who can least afford it. Thus, tariffs that rise the price of shoes burden the poor more than the rich. Despite the powerful case for free trade, the United States and the rest of the world have always been protectionist to some degree. This is because free trade benefits the general public, while protectionism benefits special interest group, which are better organized, better financed and more informed. To make matters worse, much of what we hear on this issue is misinformation spread by the special interests themselves.
Why has protectionism always been exercised even if it is wasteful and unjust? Because ______.
细节题。本题问“既然贸易保护主义又浪费又不公正，为什么还总是有贸易保护主义的存在”。根据文章最后一段倒数第二句可知，贸易保护主义使特殊群体受益。故选项D“它使有特权的少数人受益”为正确答案。其他选项与原文不符。
下列关于公司的表述，正确的是（）
以下各项列举了我国常见气象灾害与其发生地区的对应关系，其中正确的一项是（）
根据电视收视率调査，看体育节目的观众中青年人比中老年人要多。
由此可推断出（）
—种海洋蜗牛产生的毒素含有多种蛋白，把其中的一种给老鼠注射后，会使有两星期大或更小的老鼠陷入睡眠状态，而使大一点的老鼠躲藏起来。当老鼠受到突然的严重威胁时，非常小的那些老鼠的反应是呆住，而较大的那些老鼠会逃跑。
以上陈述的事实最有力地支持了以下哪项假说？（）
疾病控制中心对某校髙中三个年级的学生进行抽样做视力状况调查，抽样的方法为分层抽样（按比例抽样），若高中一、二、三年级学生人数分别为626、703、780，样本容量为84，则应从离二年级抽样的学生人数为多少？（）
