1. Even young students who plan on staying in the United States just long enough to finish two semesters of high school have difficulty finding a host family.
    甚至那些计划在美国完成两个学期中学课程的年轻学生也很难找到接待家庭。

2. Every year the United States is host to an average of 78,000 foreign high school level students, of which 3,000 are Brazilian.
    美国平均每年要接待78,000名中学学历程度的外国学生，其中3,000个来自巴西。

3. Britain has an unwritten constitution, and the United States has a written constitution.
    英国有不成文的宪法, 美国有成文的宪法.

4. Before it could be transported to the United States, a site had to be found for it and a pedestal had to be built.
    在雕像被运往美国之前，必须为它选好一块场地，同时必须建造一个基座。

5. BellSouth Corporation, with operations in four wireless markets, estimates its annual revenue per average customer at about $2,000 as compared to $860 in the United States.
    在四个无线电话市场有营运点的贝尔南方电话公司估计它的年收入约为平均每个客户2,000美元，与之相比，在美国国内的收入是860美元。

6. Within a few days of Washkansky´s transplant, another operation was performed in the United States, by Dr. Adrian Kantrowitz.
    沃什坎斯基心脏移植手术后没几天，美国的亚德里恩·坎特罗威茨医生完成了另一例手术。

7. The Constitution of the United States has over twenty amendments.
    美国宪法有二十多条修正案。

8. The United States annexed Texas in 1845 .
    1845年美国合并了德克萨斯。

9. The largest emigration from Europe came to the United States in 1970.
    一九七○年, 人数最多的一批欧洲移民来到美国。

10. The United States has a heterogeneous population.
    美国人口混杂。