题目内容
What is difference between /f/ and /v/ in voicing?/f/ is__________ and /v/ is__________.
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How many fricatives are there in English?There are _______fricatives. (空格处请填入英文数字)
Stop consonants are made by completely stopping the airflow at some point in the mouth and then release it into the sound that follows.
摩擦音发音时，气流部分受阻。摩擦音是由发音器官造成的缝隙使气流产生摩擦而发出的声音。
下列谚语中,与先动优势和后发优势无关的是()。
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