单项选择题

The best title for the passage would be ______.

A．Schools in the USA
B．Elementary Schools in the USA
C．Secondary Schools in the USA
D．Colleges and Universities in the USA
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单项选择题
Nearly half of all college students ______ while they are in school.
A．are free
B．are busy
C．have part-time(兼职的)jobs
D．have full time jobs
单项选择题
Studying carefully the clues in the passage, we learn that the total population of Africa is ______.
A．approximately seven hundred million
B．approximately one hundred and twenty-five million
C．approximately eight or eight point five thousand million
D．exactly twenty-four million
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