Unit 1 Introduction
1、【单选题】The positional variants of the same phoneme are known as __________.
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2、【单选题】The back of the tongue helps to produce __________ sounds.
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3、【单选题】The sounds produced with the help of the upper teeth are called____ sounds（）
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4、【单选题】Using the diacritics provided by the IPA,_______ transcription captures as many aspects of a specific pronunciation as possible and makes very subtle distinctions between sounds（）
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5、【单选题】The soft palate is also called __________
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6、【单选题】The organs that take part in production of speech sounds are called____（）
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