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
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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
单项选择题
A world plan mentioned in the passage aims at ______.
A．training responsible citizens
B．enforcing the functions of UNESCO
C．helping illiterates learn how to read and write
D．urging southern European countries to take in attacking illiteracy
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