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operational
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单项选择题
The most obvious and rapid change in the development of a language takes place in the area of ______.
A．pronunciation
B．vocabulary
C．grammar
D．speech
单项选择题
Ireland is called the Emerald Isle for its rich green countryside, but politically it is divided into two parts: ______.
A．Northern Ireland and Southern Ireland
B．Southern Ireland and the Republic of Ireland
C．the Republic of Ireland and Northern Ireland
D．Northern Ireland and Britain
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