American newspapers and magazines have been taking public opinion polls since the 1800s. In the 1930s, poll experts such as Elmo Poper and George Gallup began using scientific methods to select and interview participants in political surveys. Since the 1940s, American businesspeople have been developing, naming, packaging, and promoting products with the help of surveys. And also since the 1940s,surveys have been a major research tool among scholars in the social sciences. Psychologists and sociologists have asked people about everything from their religious beliefs to their sexual behavior. The mass media have frequently reported the results of these surveys, and the American public has always been quite interested in the responses.
However, the most complete and most important survey for Americans is the national census. A census is the official count of the number of people living in a city, state, or country. The idea of a census has existed for more than two thousand years. In ancient Rome, the government counted its citizens for purposes of taxation and military service. But the first modern census began here in the United States in 1790. In that year, the population of the new nation was 3 929 214. Since 1790, the American government has taken a census every ten years, and the population has been growing steadily every decade. The 1980 census reported a population of 226 504 825.
In addition to statistics on the total population, the 1980 census has given us a great deal of information about recent changes in American life. One of the many important changes concerns where people live. Americans are still a mainly urban people with about 75 percent of the population living in or near large cities. But, since 1970, the small communities have been gaining population at a faster rate then the cities or suburbs. American have been moving hack to the small towns and the rural areas. This is a dramatic change from the trend in preceding decades. Americans have always done a great deal of moving from one part of the country to enother, but, in recent years, the moves have been mostly to the South and West. States in the "Sun Belt" have been gaining population, and states in the Northeast and the Midwest have been losing population.
Marriage and family life have been changing, too. Americans have been marrying later, having fewer children, getting more divorces, and living more often as singles or as unmarried couples. The actual number of married couples has risen in recent years, but the percentage of married people has declined. Similarly, the number of actual births has gone up, but the size of the average family has gone down. The average young woman of today plans to have only two children.
Along with many other surveys, the national census gives Americans a statistical picture of a changing society. It allows the government and the people to see what's happening and to adjust to the new picture.
The main idea of the passage is that ______.
A.the census gives an accurate count of the number of people in the United States
B.the United States government has taken a census every ten years
C.the census gives a lot of information about population and changes in American life and society
D.according to the latest census, the average American is happier than ever before
第1题
单击Windows任务栏中的()按钮,将鼠标指针移动到程序命令,再单击它的级联菜单中的“Microsoft Excel”即可启动Excel97。
A.开始
B.时间
C.文件
D.编辑
第2题
在Windows XP中,不能打开资源管理器窗口的操作是()。
A.用鼠标右键单击“开始”按钮
B.用鼠标右键单击桌面上的“我的电脑”图标
C.用鼠标左键单击“开始”按钮“程序”级联子菜单中的“Windows资源管理器”命令
D.用鼠标左键单击“任务栏”的空白位置处
第3题
在Windows中,下列叙述正确的是
(A) “开始”菜单只能用鼠标单击“开始”按钮才能打开
(B) Windows任务栏的大小是不能改变的
(C) “开始”菜单是系统生成的,用户不能再设置它
(D) Windows任务栏可以放在桌面四个边的任意边上
第4题
在Windows中,下列叙述正确的是
(A)“开始”菜单只能用鼠标单击“开始”按钮才能打开
(B)Windows任务栏的大小是不能改变的
(C)“开始”菜单是系统生成的,用户不能再设置它
(D)Windows任务栏可以放在桌面四个边的任意边上
第5题
下列叙述中,正确的一条是( )。
(A)“开始”菜单只能用鼠标单击“开始”按钮才能打开
(B)Windows的任务栏的大小是不能改变的
(C)“开始”菜单是系统生成的,用户不能再设置它
(D)Windows的任务栏可以放在桌面的四个边的任意边上
第6题
下列叙述中,正确的一条是( )。
(A) “开始”菜单只能用鼠标单击“开始”按钮才能打开
(B) Windows的任务栏的大小是不能改变的
(C) “开始”菜单是系统生成的,用户不能再设置它
(D) Windows的任务栏可以放在桌面的四个边的任意边上
第7题
Windows中,不能打开“资源管理器”窗口的操作是
A.用鼠标右键单击“开始”按钮
B.用鼠标左键单击“任务栏”空白处
C.用鼠标左键单击“开始”菜单中“程序”下的“Windows资源管理器”命令
D.用鼠标右键单击“我的电脑”图标
第8题
在Windows中,下列叙述中正确的是______。
A.“开始”菜单只能用鼠标单击“开始”按钮才能打开
B.任务栏的大小是不能改变的
C.“开始”菜单是系统生成的,用户也可以再设置它
D.任务栏中的内容不能根据用户操作而增减
第9题
下列叙述中,正确的是【】
A.“开始”菜单只能用鼠标单击“开始”按钮才能打开
B.“Windows”的任务栏的大小是不能改变的
C.“开始”菜单是系统生成的,用户不能再设置它
D.Windows的“任务栏”可以放在桌面的4个边的任意边上
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