单项选择题

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

A. Brazil
B. Canada
C. Britain
D. China

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单项选择题
() is the largest and busiest commercial city on the Pacific coast.

A. Los Angeles
B. San Diego
C. San Francisco
D. Seattle
单项选择题
() is the nation’s leading center of heavy industry.

A. Midwest
B. Northeast
C. Southeast
D. Southwest
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