B. receive parly free education
C. receive no free education if their families are rich
D. receive no free education at all
39. With regard to its size, the USA is the _____ country in the world.
A. largest B. second largest C. third largest D. fourth largest
40. In the following rivers, _____ has been called the American Ruhr.
A. the Mississippi B. the Missouri C. the Hudson D. the Ohio
41. Among the following rivers, _____ forms a natural boundary between Mexico and the U.S.
A. the Potomac B. the Columbia C. the Rio Grande River
D. the Colorado
42. All the following universities and colleges are located in New England, except _____.