已知一样本含量n＝25，s＝80，其标准误为（）。A．4.8 B．16 C．30 D

1954年日内瓦会议召开前夕，周恩来 * * 说：“如今，我们是作为一个大国，到日内瓦去参加一个正式的国际会议，是登上国际舞台了，因此要唱文戏，文戏中有武戏，但总归是一个正规戏、舞台戏。”周 * * 这里所说的“文戏中有武戏”主要是指(　　)

A．就朝鲜南北统一提出合理化建议

B．就印度支那和平行动提出合理化建议

C．宣传和扩大和平共处五项原则的努力

D．宣传和扩大“求同存异”的外交策略

内部分析

设y(x)＞0，y(0)=1，y’(0)=1，又曲线y=y(x)是单调的，凹凸性不变，且其上任意点处的切线及y轴和y=y(x)所围成的平面图形的面积等于切点处横坐标的立方，求L的方程．

飞机的分类可以按照构成飞机的构件进行

In the United States, older people rarely live with their adult children. But in many other cultures children are expected to care (1) their aged parents. In some parts of Italy, the percentage of adult children who (2) with their parents (3) 65 to 70 percent. In Thailand, too, children are expected to take care of their elderly parents; few Thai elderly live (4) . What explains these differences in living arrangements (5) cultures Modernization theory (6) the extended family household to low levels of economic development. In traditional societies, the elderly live with their children in large extended family units for economic reasons. But with modernization, children move to urban areas, leaving old people (7) in (8) rural areas. Yet modernization theory cannot explain why extended family households were never common in the United States or England, or why families in Italy, which is fully modernized, (9) a p tradition of intergenerational living. Clearly, economic development alone cannot explain (10) living arrangements. Another theory associated intergenerational living arrangements with inheritance patterns. In some cultures, the stem family pattern of inheritance (11) . (12) this system, parents live with a married child, usually the oldest son, who then (13) their property when they die. The stem family system was once common in Japan, but changes in inheritance laws, (14) broader social changes brought (15) by industrialization and urbanization, have (16) the (17) .In 1960 about 80 percent of Japanese over 65 lived with their children; by 1990 only 60 percent did-a figure that is still high (18) U.S. standards, but which has been (19) steadily. In Korea, too, traditional living arrangements are (20) : the percentage of aged Koreans who live with a son declined from 77 percent in 1984 to 50 percent just 10 years later. Although most elderly Koreans still expect to live with a son, their adult children do not expect to live with their children when they grow old.

3（）

A.amasses

B.amounts

C.attains

D.reaches