The English language has always changed, but the rate of change has been uneven.A.portionB
The English language has always changed, but the rate of change has been uneven.
A.portion
B.speed
C.standard
D.measure
B
解析:名词辨析rate表:比率,速度,等级,价格;而选项A portion部分,一份,分得的部分;B speed速度,速率,迅速;C standard标准,规格,本位;D measure措施,测量,量度标准;因此B为答案。