[单选题] Which of the following vowels doesn't fall under the same category according to the length
of the sound?

1、[单选题]Which of the following statement is correct in terms of stress ？

• A、THE streets are WIDE and CLEAN.
• B、The streets are WIDE AND CLEAN.
• C、 The STREETS are WIDE and CLEAN.
• D、The STREETS ARE wide and CLEAN.

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2、[单选题]According to shape of the lips, English vowels can be classified into ______.

• A、open vowels and close vowels
• B、front, central, and back vowels
• C、 rounded and unrounded vowels
• D、monophthongs and diphthongs

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3、[单选题].Which of the following is a front vowel?

• A、u]
• B、[u:]
• C、[ɔ:]
• D、D.[i]

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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]Which word of the following has the proper word stress?

• A、PHOtographer
• B、photoGRApher
• C、 phoTOgrapher
• D、PhotograPHER

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