Service industries account for about ___ of the US gross domestic product.
A. a third
B. half
C. two thirds
D. three fourths
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The westward expansion is a demonstration of American ___.
A. individualism
B. patriotism
C. liberalism
D. expansionism
With the arrival of the 20th century, the US became increasingly urbanized, particulary in the ___ cities.
A. Northeast
B. Northwest
C. Southeast
D. Southwest
As the world's leading maker of industrial goods, the US now produces around ___ of the world's industrial products according to the text book.
A. 20%
B. 25%
C. 30%
D. 35%
___ are the factors that have contributted to the development of the US economy.
A. the vast space and resources of the land
B. the ideals of freedom and ecnomic prosperity
C. English as its natioanl language
D. hard work by the people