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

1、[单选题]In terms of manner of articulation, the sounds [f], [v], [ʃ], [ʒ]are ________.

• A、affricates
• B、fricatives
• C、 bilabial
• D、oral stops

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2、[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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3、[单选题]There are _____ nasals in English.

• A、three
• B、two
• C、four
• D、one

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4、[单选题][i:], [ɜ:], [u:] are classified according to _____.

• A、the openness of the mouth,
• B、he length of the vowels.
• C、the shape of lip
• D、the position of the tongue in the mouth

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5、[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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