单项选择题


A．lead to
B．cause
C．produce
D．reach
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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 accelerate
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．Non
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