47. How can humid settings help opera singers achieve the right pitch?
(A) Singers have more elastic vocal cords.
(B) Singers feel tiny variations in pitch.
(C) Singers experience wavering volume.
(D) Singers make refrains more roughly.
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統計: A(154), B(25), C(11), D(6), E(0) #1332878
統計: A(154), B(25), C(11), D(6), E(0) #1332878