[单选题] Which of the following word category is not usually be stressed in the sentence？

1、[单选题].The four sounds /p/, /b/, /m/ and /w/ have one feature in common, i.e., they are all ______.

• A、bilabial
• B、labiodental
• C、 dental
• D、fricatives

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2、[单选题]Vowel sounds are differentiated by the following factors EXCEPT______.

• A、the position of the tongue in the mouth
• B、the openness of the mouth,
• C、the length of the vowels.
• D、no obstruction of airstream

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3、[单选题].When the falling tone is used, it refers to_______？

• A、what is said is a straight forward, matter-of-fact statement.
• B、making a question of what is said.
• C、 there is an implied message in what is said.
• D、being uncertain of what is said.

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4、[单选题].In English, all the front vowels and central vowels are ______ vowels.

• A、.rounded
• B、open
• C、 close
• D、unrounded

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5、[单选题]The consonant [n] in English can be correctly described as having the following phonetic
features: ______.

• A、voiceless, alveolar, fricative
• B、voiceless, labiodental, nasal
• C、 voiced, alveolar, nasal
• D、voiced, labiodental, fricative

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