The word “minister” originally meant“a servant”, but now has changed to“a head of a ministry”. This process of meaning change is called（）.
A.extension
B.elevation
C.degradation
D.specialization
正确答案B 
The word “minister” originally meant“a servant”, but now has changed to“a head of a ministry”. This process of meaning change is called（）.
A.extension
B.elevation
C.degradation
D.specialization
正确答案B 