单项选择题

A．A sick friend.
B．A math class.
C．School policy.
D．The man’s test.
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单项选择题
What can be concluded when the current tide of knowledge revolution ebbs
A．Productivity will rise.
B．Productivity will receive no impact.
C．Population growth will slow down.
D．Population growth will become accelerated.
单项选择题
How many significant demographic changes ever occurred in the past one million years
A．One.
B．Two.
C．Three.
D．None.
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