单项选择题

According to the interview, how many people have been added to the Earth’s population in the past century

A．its growing birth rates
B．the migration of persons from other countries
C．its good health condition
D．its longer life expectancy
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单项选择题
A．80 millionB．60 millionC．50 millionD．40 million
A．80 million
B．60 million
C．50 million
D．40 million
单项选择题
A．one, oneB．one, twoC．two, twoD．two, one
A．one, one
B．one, two
C．two, two
D．two, one
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