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To many Americans,Labor Day marks the end of the summer,a day off from work and school,and one last chance to relax.But Labor Day is much more than just a day off . It represents a very important victory for laborers everywhere.The holiday is a celebration of the social and economic achievements of American workers. More than a century ago,workers were forced to deal with harsh conditions.They were paid very little, and they often worked 10-to l2-hour days.Men, women and even small children were forced to work even when they were sick.Tired of long hours and dangerous conditions,workers began organizing themselves into labor unions.On top of fighting for higher pay and shorter workday s,they also fought for the rights of children.The workers wanted employers to place limits on the age of their workers so that small children were not overworked or hurt in factories. A New York City carpenter named Peter McGuire is credited for coming up with the idea for Labor Day.In 1872,after working many hours under poor conditions, McGuire rallied 100,000 workers to go on strike.The workers marched through the streets of New York City,demanding a better work environment.McGuire spent a decade fighting for workers’ rights.In 1882,he proposed the idea to create a special holiday for workers.On Tuesday,September 5,1882.more than 10,000 workers hit the streets of New York City for the first ever Labor Day parade.Two years later the celebration was moved to the first Monday in September.And in 1894,Congress passed a law making Labor Day a national holiday. Americans celebrated the first Labor Day holiday with a parade,picnics and fireworks.Today,many people hit the road to enjoy the last of their summer vacation.Others enjoy the long weekend with picnics,backyard barbecues or just rest and relaxation.However you spend Labor Day,remember that the holiday is a time to pay tribute (致敬)to the workers who have made America what it is today. 小题1:What do we know from Paragraph 1 ? A.Americans have more than a day off on Labor Day. B.Many countries in the world celebrate Labor Day. C.Labor Day has a deep meaning for American laborers. D.Labor Day shows the social and economic power of America. 小题2:What is Paragraph 2 mainly about? A.American workers’ fighting against their employers. B.The bad life that American workers 1ed. C.How American employers treated their workers. D.The life that American workers ever expected. 小题3:The underlined word “rallied” in Paragraph 3 can be replaced by“___________”. A.persuaded B.supported C.rewarded D.gathered 小题4:Which of the following statements is TRUE according to the passage? A.There were about 100,000 workers in New York City in 1872. B.Labor Day became a national holiday in 1884. C.In 1872 Labor Day was first put forward by McGuire. D.The first ever Labor Day parade was held in 1882. 小题5:According to the author,while spending Labor Day,Americans should feel _________ . A.su rprised B.thankful C.dissatisfied D.superior
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【简答题】(本小题满分12分) 如图6,正方形 所在平面与圆 所在平面相交于 ,线段 为圆 的弦, 垂直于圆 所在平面,垂足 是圆 上异于 、 的点, ,圆 的直径为9. (1)求证:平面 平面 ; (2)求三棱锥D-ABE的体积.
【单选题】正常成人的血液总量约相当于体重的
A.
7%~8%
B.
15%
C.
20%
D.
60%
E.
40%
【简答题】(本小题满分1 3分)如图6,正方形 所在平面与圆 所在平面相交于 , 线段 为圆 的弦, 垂直于圆 所在平面, 垂足 是圆 上异于 、 的点, ,圆 的直径为9. (1)求证:平面 平面 ; (2)求二面角 的平面角的正切值.
【简答题】如图, 是以 为直径的半圆 上异于 的点,矩形 所在的平面垂直于半圆 所在的平面,且 。 (1)求证: 。 (2)若异面直线 和 所成的角为 ,求平面 和平面 所成的锐二面角的余弦值。
【单选题】在发酵过程中,pH监测可以用( )来进行。
A.
复膜溶氧电极
B.
pH电极
C.
温度探头
D.
空气流量计
【简答题】如图,正方形ABCD所在平面与圆O所在平面相交于CD,线段CD为圆O的弦,AE垂直于圆O所在平面,垂足E是圆O上异于C、D的点,AE=3,正方形ABCD的边长为 . (1)求证:平面ABCD丄平面ADE; (2)求四面体BADE的体积; (3)试判断直线OB是否与平面CDE垂直,并请说明理由.
【简答题】如图6,正方形 所在平面与圆 所在平面相交于 ,线段 为圆 的弦, 垂直于圆 所在平面,垂足 是圆 上异于 、 的点, ,圆 的直径为9. (1)求证:平面 平面 ; (2)求二面角 的平面角的正切值.
【单选题】在发酵过程中,温度监测可以用( )来进行。
A.
复膜氧电极
B.
pH电极
C.
温度探头
D.
空气流量计
【简答题】如图, 是以 为直径的半圆 上异于 、 的点,矩形 所在的平面垂直于半圆 所在的平面,且 . (1)求证: ; (2)若异面直线 和 所成的角为 ,求平面 与平面 所成的锐二面角的余弦值.
【单选题】正常成人的血液总量约相当于体重的
A.
8%
B.
15%
C.
20%
D.
60%
E.
40%
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