单项选择题

Elementary and secondary education is ().

A. free
B. free and attendance is required by law
C. compulsory
D. Both B and C.

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单项选择题
Which of the following does not belong to the three principal functions of U.S. higher education().

A. Teaching.
B. Research.
C. Public service.
D. Social charity.
单项选择题
There is () age limit for adult education.

A. no
B. some
C. definite
D. None of the above
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