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Practice 4 The United States perceives itself to be a middle-class nation. However, middle class is not a real designation, nor does it carry privileges(特权). It is more of a perception, which probably was as true as it ever could be right after World War II. The economy was growing, more and more people owned their own homes, workers had solid contracts with the companies that employed them, and nearly everyone who wanted a higher education could have one. Successful people enjoyed upward social mobility. They may have started out poor, but they could become rich. Successful people also found that they had greater geographic mobility, In other words, they found themselves moving to and living in a variety of places. The middle class collectively holds several values and principles. One strong value is the need to earn enough money to feel that determine one’s own economic fate. In addition, middle-class morality(道德观) embraces principles of individual responsibility, importance of family, obligations to others, and believing in something outside oneself. But in the 1990s those in the middle class found that there was a price for success. A U. S. New& World Report survey in 1994 indicated that 75 percent of Americans believed that class families could no longer make ends meet. Both spouses now worked, as did of the children; long commutes became routine; the need for child care put strains on the families; and public schools were not as good as they once were. Members of the middle class were no longer financing their lifestyles through earnings but were using credit to stay afloat. The understanding of just what middle class meant was changing.
以下所列“循证医学”的要素学中，作为循证医学的基石的是（）
设计面向学生的教材封面时，其装帧工艺材料和表面整饰加工工艺以（ ）为宜。[2009年真题]
在以下选项中，关于争议的解决方式说法错误的是：（）
正常情况下，肢体产生的活动是受（）支配的
提出教师成长公式"经验+反思=成长"的是（）。
防毒面具是用来保护劳动者免受有害物质的侵害，防止职业中毒的个人防护用品，按防护个体的部位划分可分为（）、（）防护品两大类。
镁的比重小很（），镁合金在一定的热处理后具有较大的强度。
使用PPPoE方式管理以太网用户的接入，只需要在以太网交换机后增加一个PPPoE接入服务器就行，非常方便。（）
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