单项选择题

Distinctive sound refers to______.

A．allomorph
B．phoneme
C．phone
D．minimal pairs
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单项选择题
The Franklin Roosevelt came into power in the period of______.
A．Depression
B．WW Ⅰ
C．WW Ⅱ
D．Civil War
单项选择题
The main rivers parting in Britain run from______
A．north to south
B．south to north
C．east to west
D．west to east
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