中国大学MOOC: Pure vowels can be classified into three categories: front vowels, central vowels and back vowels. The two vowels/ɜː/ and /ə/ are classified into ______ vowels because they are made with the middle part of the tongue being raised.
举一反三
- 中国大学MOOC: How can you distinguish between front vowels, central vowels, and back vowels?
- According to the shape of the lips, vowels can be classified into close vowels, semi-close vowels, semi-open vowels and open vowels. A: 正确 B: 错误
- According to the part of the tongue which is raised, vowels can be divided into the following kinds: front, middle, central, back.
- 中国大学MOOC: In the following vowels, are back vowels.
- 中国大学MOOC: Among the 20 vowels in RP, there are 12 pure vowels and 8 diphthongs.