单项选择题

Formal education in the United States consists of().

A. kindergarten, junior and senior education
B. junior, elementary and secondary education
C. elementary, secondary and higher education
D. kindergarten, secondary and higher education

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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.

单项选择题

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

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