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[主观题]
Consonants vary depending on where and how the air stream gets through, the place and
movement of the tongue, and also whether the voice is used or not.()
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The structure of the sound system involves not only the vowels and consonants --- the segmental features, but also stress and intonation --- the supra-segmental features.()
A.Stops
B.bilabial
C.fricative
D.glides
A. consonants
B. vowels
C. pure vowels
D. diphthongs
A.Because students vary in needs,
B.Because teaching methods vary greatly.
C.Because schools offer different subjects.
D.Because there are different aids at school.
This plan must be ______ if it is to carried out successfully. (alter, change, modify, vary)
A.to use
B.using
C.use
D.used