题目内容

Listen carefully and choose the word you hear.

A. heat
B. feet

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Listen carefully and choose the word you hear.

A. leave
B. leaf

Which of the following letter or letter groups can be pronounced as /f/?

A. f
B. ff
C. ph
D. gh

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)