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Practice 7 Average household debt in the United States is currently 130 percent of average household income. The U. S. household savings rate is close to zero. Consumer confidence has plummeted with the value of 401(k) plans and retirement nest eggs. Car sales are at a fifteen-year low. And credit card defaults look like the next shoe to drop as cash-strapped Americans have run up credit card debt to postpone the day of reckoning. Too many Americans have been expressing the Dream through the acquisition of stuff. Americans need a refresher course on the American dream. The Constitution speaks of life, liberty, and the pursuit of happiness, not an automatic chicken in every pot. The American Dream embraced by immigrants over the past two centuries has been the opportunity to set one’s own goals and pursue them honestly to the limits of one’s ambition and ability. Too many Americans have been expressing the Dream through the acquisition of stuff. Others see the Dream as raising a family in a land that delivers Franklin Roosevelt’s four freedoms. Still others dream of their children accessing the highest possible level of education, living healthy lives, being good citizens in their communities.
儿童外伤中，环椎前结节后缘与枢椎齿状突前缘的距离大于4mm，则说明（）
依次填入下列各句横线处的词语，最恰当的一组是（ ）。①逐步推广使用清洁的可再生能源，减少使用污染环境的能源，是______环境恶化的正确选择。②随着人们自律程度的不断提高，过去有些需要用铁栏杆来维持______的地方，现在只要拉绳或画线就行了。③具有世界影响的中国画大师张大千，人物、花鸟、鱼虫、走兽无一不精，______画山水。
患者，女性，54岁。因频繁出汗、心悸、紧张、怕热、胃口增加和体重减轻2月余而就诊。最可能的诊断是（）。
机舱前后的舱壁采用（）；首尾尖舱的舱壁采用（）。
创新人才是创新能力的根本所在.
呼吸衰竭导致肺性脑病的主要发生机制是（）
“马作的卢飞快”的下一句是什么？
防止电力机车误入无网区的措施：单机转线时，应问清进路，作好防误进无电区的预想和呼唤应答。注意确认（）标志，在枢纽站场锚段关节禁停区内严禁停车。
(07年真题)在我国企业生产的产品中，外购的材料、零部件等所占的比例较大，机械产品一般占( )
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