单项选择题

Baby boom' refers to the great increase of birth rate between ______.

A．1946 and 1964
B．1860 and 1890
C．1920 and 1935
D．1845 and 1854
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单项选择题
The longest river in Canada is ______.
A．the Seven
B．the Yukon
C．the Mackenzie
D．the St. Lawrence
单项选择题
______ is a design feature of human language that enables speakers to talk about a wide range of things, free from barriers caused by separation in time and space.
A．Displacement
B．Arbitrariness
C．Duality
D．Productivity
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