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主窗体只能显示为式的窗体，子窗体可以显示为窗体，也可以显示为__窗体。

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Questions 11 -13 are based on the following passage. You now have 15 seconds to read questions 11 -13. What is the passage mainly about

American consumers.
B. American seller-producers.
C. American economic system.
D. American price system.

在亲电取代反应中，苯环上的—CF3是定位基，CH3CO2—是定位基。

People in the United States in the nineteenth century were (21) by the (22) that unprecedented change in the nation’s economy would bring social (23) . In the years following 1820, after several decades of relative stability, the economy (24) a period of (25) and extremely rapid growth that continued to the end of the nineteenth century. (26) that growth was a structural change that (27) by increasing economic diversification and a gradual shift in the nation’s labor force from agriculture to manufacturing and other nonagricultural pursuits. Although the birth rate continued to decline from its high level of the eighteenth and early nineteenth centuries, the population roughly doubled every generation during the rest of the nineteenth century. As the population grew, its (28) also changed. Massive waves of immigration brought new ethnic groups into the country. Geographic and social mobility--downward as well as upward-- (29) almost everyone. Local studies (30) that nearly three-quarters of the population in the North and South, the emerging cities of the Northeast, and in the restless rural counties of the West changed their residence each decade. As a (31) , historian David Donald has written, "Social atomization affected every segment of society", and it seemed to many people that "all the recognized values of orderly civilization were gradually being eroded." Rapid industrialization and increased geographic mobility in the nineteenth century had special (32) for women because these changes tended to (33) social distinctions. As the roles men and women played in society became more rigidly defined, so did the roles they played in the home. In the (34) of extreme competitiveness and dizzying social change, the (35) lost many of its earlier functions and the home came to serve as a (36) of tranquillity and order. As the size of families decreased, the roles of husband and wife became more clearly (37) than ever before. In the middle class especially, men participated in the productive economy while women (38) the home and served as the custodians of civility and culture. The intimacy of marriage that was (39) in earlier periods was rent, and a gulf that at times seemed unbridgeable was (40) between husbands and wives.

A. affected
B. contacted
C. impressed
D. touched

阅读下面短文，回答问题。我就职的第一家公司是一家美资公司。员工餐厅位于办公楼的三楼。某天晚上我加班到近十点钟，离开时发现整个办公楼里只剩下我，但走廊的灯全都亮着，多浪费呀，我心里想着，不仅关了一楼走廊的灯，还爬上二楼三楼，把灯全关了。第二天早会上，外籍经理说：“昨天是哪位员工最后一个离开的办公楼感谢他为公司节约考虑熄灭了所有的灯。但是，从安全的角度，我们要让所有走廊通宵明亮，因为夜班员工可能要到三楼进餐，黑暗的楼道容易摔跤。我们付出的是有限的电费，但避免了潜在的伤害。” 我就职的第二家公司是一家英资公司。负责安全的经理给新员工的安全培训中说：“一旦发生火灾，公司不需要你们去救火或者去抢救公司财产。员工是公司最宝贵的财产，人的生命最宝贵。你们要做的是保证自身的安全，迅速撤离，在确保自身没有危险的情况下，拨打119火警电话，请专业人员来灭火。” 到底什么是最重要的我不禁联想到20世纪80年代讨论的大学生张华为救落入粪池的老大爷而牺牲，以及前些天报道的中学生为抢救落水同学，自己再也没有上来的事情。我想说，我们应该从小就教育下一代，好好爱惜生命，不要教育或诱导他们不管自身条件，不计客观效果，盲目舍己救人。对生命的珍视和爱护程度体现着这个国家的文明程度。让他们在救人时，能够客观权衡。西方国家从来没有过这样舍己救人舍生抢救国家财产的教育和舆论导向，他们受到的都是生命至上的人本主义教育。但我在国外绝少看到危难或交通事故时有人袖手旁观，遇到紧急情况总有很多自发自觉的救助者，从他们身上我看到的是人性的光辉。但从我们这些懵懵懂懂跳下河去再也没有上来的孩子身上，我感觉到的只是痛惜和痛心。真正做到以人为本，我们还有很长的路要走，这是我们这一代人，甚至几代人的责任。 (一冰《经历“以人为本”》) 作者在西方看到的“人性的光辉”是指：

A. 盲目舍己救人。
B. 总有人出面救助。
C. 有人袖手旁观。
D. 作无谓的牺牲。