[填空题]What kind of nation was the United States in the past
It was a nation of ______.

[填空题]

In the United States, what is the leading cause of death from liver failure

[单项选择]The United States is a nation of immigrants. By the year 2000, more than 11% of all Americans were foreign born. Which state has the largest number of immigrants（）
A. New Jersey
B. California
C. New York
D. Arizona

[单项选择]The United States is a sports - loving nation. Sports in America take a variety of forms : organized competitive struggles, which draw huge crowds to cheer their favorite team to victory; athletic games, played for recreation anywhere sufficient space is found; and hunting and fishing. Most sports are seasonal, so that what is happening in sports depends upon the time of year. Some sports are called spectator sports, as the number of spectators greatly exceeds the number playing is the game.
In the United States ,people enjoy all the following sports EXCEPT
A. organized competitive struggles.
B. athletic games.
C. hunting and fishing.
D. mountain climbing and bicyclin

[填空题]The United States government wants to know what the public thinks about its findings on the safety of (36) animals.
The Food and Drug Administration says meat and milk from clones of adult cattle, pigs and goats are safe to eat. An FDA (37) called them "as safe to eat as the food we eat every day."
And when those clones (38) sexually, the agency says, their (39) are safe to eat as well. But research on cloned sheep is limited. So the FDA (40) that sheep clones not be used for human food.
The United States this year could become the first country to (41) the sale of foods from cloned animals.
First, however, the public will have ninety clays to (42) on three proposed documents. On December twenty-eighth the FDA released a long report, called a draft risk (43) , along with two policy documents.
(44) . The FDA seemed ready to act several years ago, but an adv

[简答题]What is the economic problem facing United States

[填空题]The United States has most of what every country would like to have coal and (11) and other minerals, cereals (wheat. barley, maize), beef, cattle, fruit plantations of all kinds, as well as (12) Yet, as in most countries, there is unemployment and the fear of unemployment, and few people like (13) unemployed more than the Americans. They are paid well, even in quite simple jobs, and their taxes are low, so they do not often come out on (14) for unimportant reasons. Union officials in the factories are employed not only to make sure the workers get (15) treatment, but also to see that they work as well as they can.