单项选择题

The word "demographic" (Line 4, Para. 1 ) means_________.

A．statistics of human
B．surroundings study
C．accumulation of human
D．development of human

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单项选择题

During the first period of demographic history, societies were often in danger of extinction because_________.

A．only one in ten persons could live past 40
B．there was higher mortality than fertility in most places
C．it was too dangerous to have babies due to the poor conditions
D．our ancestors had little enthusiasm for more children

单项选择题

Which statement is TRUE about population increase

A．There might be an increase of 2.2 billion persons from now to the year 2000.
B．About 50,000 babies are born every, six hours at present.
C．Between 8000 B.C. and the present, the population increase is about 80,000,000 persons each year.
D．The population increased faster between 8000 B. C. and 1650 than between 1650 and the present.

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