单项选择题

What kinds of families are described in the passage

A．Families of the past and of the future.
B．Families of the present and of the future.
C．Families of the past.
D．Both B and C.
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What is underemployment
A．Unemployment.
B．Having jobs but not being paid enough.
C．Having jobs from time to time.
D．Having pm-time jobs.
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What was the worlds population in 1500
A．300 million.
B．310 million.
C．500 million.
D．510 million.
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