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
Which of the following ways of word-formation doesn't change the grammatical class of the stems
A．compound
B．inflection
C．derivation
D．coinage
单项选择题
In 1964-1966, major resource of natural gas were discovered in the British sector of ______.
A．North Sea
B．Ireland
C．Wales
D．London
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