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.
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单项选择题
According to the passage, where did the first colors for painting come from
A．Animal skins.
B．The ground.
C．Trees and leaves.
D．Caves.
单项选择题
Which of the following is NOT TRUE according to the passage
A．Human population expands at a straight upward trend.
B．Population growth has shown ups and downs in demographic history.
C．Population growth can not be regarded as a social failure.
D．Increase in population is related to productivity.
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