连枷胸的患者，吸气时软化的胸壁内陷，呼气时则相反。()

材料一：小刚说：“我应该成为人人羡慕的人。我不可能在别人面前出丑。假如让别人知道我有所不知，有所不懂，就会有失自尊。我必须永远高人一等。……”晚年的发明之师爱迪生，对下人说：“你们不要向我建议什么，任何高明的建议都超越不了我的思维。”

材料二：小娟因为数学成绩不理想，在数学课堂上不敢举手，不敢当众表达自己的看法。

根据上述材料，回答下列问题：

（1）材料一、二分别说明了什么心理现象？为什么？

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（2）以上这些心理现象有什么共同点？

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（3）在日常生活和学习中，你打算怎样做一个自信的人？

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音乐随身听：是针对无线音乐俱乐部会员推出的特色服务，客户通过下载安装的客户端软件获得海量音乐的（）、（）、（）、（）、（）等服务

分线设备有哪些技术要求（）？

A.使用环境

B.电气性能

C.机械物理性能

D.防腐性能

非去极化肌松药的主要作用机制是

A．激动N₁受体
B．阻滞N₁受体
C．激动N₂受体
D．阻滞N₂受体
E．增强胆碱酯酶活性

Marriage, and its many ups and downs, still exercises a powerful hold over newspapers, magazines and the airwaves. Nearly 23m Americans watched Prince William being joined in holy marriage to Kate Middleton. Millions more have indulged in the break-up of Arnold Schwarzenegger’s marriage after revelations that he fathered a son with a maid.

Less delightful are revelations about the sorry state of marriage across the United States. Data from the Census Bureau show that married couples, for the first time, now make up less than half of all households.

The iconic American family, with mom, dad and kids under one roof, is fading. In every state the numbers of unmarried couples, childless households and single-person households are growing faster than those comprised of married people with children, finds the 2010 census. And the trend has a potent class dimension. Traditional marriage has evolved from a near-universal ritual to a luxury for the educated and affluent.

There barely was a marriage gap in 1960: only four percentage points separated the wedded ways of college and high-school graduates(76％ versus 72％). The gap has since widened to 16 percentage points, according to the Pew Research Centre.

"Marriage has become much more selective, and that’s why the divorce rate has come down," said Bradford Wilcox, director of the National Marriage Project at the University of Virginia in Charlottesville. The project found that divorce rates for couples with college degrees are only a third as high as for those with a high-school degree.

Americans with a high-school degree or less tell researchers they would like to marry, but do not believe they can afford it. Instead, they raise children out of wedlock. Only 6％ of children born to college-educated mothers were born outside marriage, according to the National Marriage Project. That compares with 44％ of babies born to mothers whose education ended with high school.

"Less marriage means less income and more poverty," reckons Isabel Sawhill, a senior fellow at the Brookings Institution. She and other researchers have linked as much as half of the income inequality in America to changes in family composition: single-parent families (mostly those with a high-school degree or less) are getting poorer while married couples (with educations and dual incomes) are increasingly well-off. "This is a striking gap that is not well understood by the public," she says.

Do not expect the Democratic Party, however, to make an issue of the marriage gap in next year’s elections. Unmarried women voted overwhelmingly for Barack Obama. "You don’t want to suggest to someone who isn’t married and has children that they should be married," says Ms Sawhill. "That is a scorn on their lifestyle.

According to the text, Isabel Sawhill suggests that（）

A. Americans’ marital status affects their social status

B. Americans should take others’ advice on marriage

C. people have no inclination to change others’ lifestyle

D. the impact of marriage on finance hasn’t been realized