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【单选题】C Psychology is the study of the mind and mental activities. For example, psychologists are interested in why some things make you sad, but others make you happy. They want to know why s...
A.
the mind
B.
the sports ability
C.
the feelings
D.
the whole brain
【多选题】以下是纯音的是()。
A.
人的说话声
B.
录音师使用的调音台上的纯音发生器发出的声音
C.
频谱只有单一一条谱线的声音
D.
汽车的引擎声
E.
舞台上乐手使用唯一一种乐器发出的声音