纯一度的音数减少1/2，度数不变，就是减一度音程。
查看答案
要使音程扩大，可将音程的上方音、下方音都升高。
A. 对
B. 错
The earthquake is shaking the ground, _________ .
A. rumbling and tumbling
B. rumbling andquaking
C. tumbling and shaking
D. shaking and quaking
The tornado is twisting across the Prairie, _______________________ .
A. twirling and turning
B. twirling and whirling
C. twisting and turning
D. turning andtwirling
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