When the obstruction is partial and the air is forced through a narrow passage in the mouth so as to cause definite local friction at the point, the speech sound thus produced is a ______.

When the obstruction is partial and the air is forced through a narrow passage in the mouth so as to cause definite local friction at the point, the speech sound thus produced is a ______.

A.fricative

B.affricates

C.nasals

D.liquids

正确答案是A