单项选择题

Which of the following terms is EXCLUDED from the scientists’ Demographic Research()

A. Statistics of births.
B. Statistics of deaths.
C. Statistics of breast feeding.
D. Statistics of diseases.

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单项选择题
Modern industry must have developed()

A. before the Middle Ages     
B. in Greece or Rome
C. around the 19th century     
D. machines to take tests
单项选择题
39()

A.families 
B.homes 
C.factories 
D.offices
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