单项选择题

Which one of the following is not government-run at the U.S. federal level ______

A. Motor vehicle
B. The road system
C. National defense
D. The postal service
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单项选择题
The United States is by far the industrial country in the world.
A. biggest
B. second biggest
C. third biggest
D. fourth biggest
单项选择题
The U.S. has less than of the world’s population, but it produces about ______ of the total world output.
A. 6%, 25%
B. 6%, 23%
C. 7%, 25%
D. 7%, 23%
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