While manufacturing giants such as IBM and General Electronic enjoy worldwide reputation as theh pillars of the American economy, the US economy is by no means one dominated by giant corporations.
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As the number of workers employed in the traditional manufacturing industries has declined, union membership has dropped in recent years.
A. 对
B. 错
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