题目内容
Which of the following letter or letter groups can be pronounced as /f/?
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What is difference between /f/ and /v/ in voicing?/f/ is__________ and /v/ is__________.
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。
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