单项选择题

A．Maps of Europe during different historical periods.
B．A reference book about population information of Europe.
C．Pictures showing people from different parts of Europe.
D．A work book to help him understand the study of population.
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单项选择题
A．The professor was not late. B．The professor was late because of a traffic jam. C．The professor was not willing to give the lecture. D．The professor was late because the hall was so crowded.
A．The professor was not late.
B．The professor was late because of a traffic jam.
C．The professor was not willing to give the lecture.
D．The professor was late because the hall was so crowded.
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