500 câu trắc nghiệm tổng hợp Ngữ âm - âm vị học có đáp án - Phần 2
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. vowels are the ones in the production of which the lips may be spread out so as to leave a long narrow opening between them.

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... vowels are the ones in the production of which the lips may be spread out so as to leave a long narrow opening between them.

Long

Spread

Rounded

Short

Giải thích

Chọn đáp án B