活血祛瘀药的共同作用是（）
A.活血行气
B.活血消痈
C.活血疗伤
D.活血祛瘀
E.活血通经
参考答案：D
In contrast to Standard American English, Black English is the distinct variety of English native to black populations in the USA. We regard Black English as________. ( )
A．a regional dialect
B．a social dialect
C．a situational dialect
D．an ethnic dialect
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