题目内容

As the number of workers employed in the traditional manufacturing industries has declined, union membership has dropped in recent years.

A. 对
B. 错

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The US ranks ___ in the world in the total value of its economic production.

A. first
B. second
C. third
D. fourth

What is America's most important food crop?

A. corn
B. rice
C. barley
D. oat

Service industries account for about ___ of the US gross domestic product.

A. a third
B. half
C. two thirds
D. three fourths

The westward expansion is a demonstration of American ___.

A. individualism
B. patriotism
C. liberalism
D. expansionism