单项选择题

In the United States, how many years does primary education require().

A. Four years.
B. Five years.
C. Six years.
D. Seven years.

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is the largest single source of imports for the U.S..()

A. Brazil
B. Canada
C. Britain
D. China
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() is the largest and busiest commercial city on the Pacific coast.

A. Los Angeles
B. San Diego
C. San Francisco
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