在Zm中，等价类a与m满足（）时可逆。
A. 互素
B. 相反数
C. 互合
D. 不互素
Whatcanyoudoifyouwanttospeakwithapropervolume?
A. Standupstraight.
B. Openyourmouthanddropyourlowerjaw.
C. Breathewithyourdiaphragm.
D. Findyourloudestvoice.
Whichofthefollowingstatementsis/aretrue?
A. Inflectionsarethechangesinyourpitch
B. Thereasonyouwillstammerinthespeakingcontestisthatyouarenotsurewhatyouaregoingtosay
C. Youcanreplacepausesinyourspeechwithfillerwords
D. Youcanmakeyourspeechfluentbyspeakingnonsense
Publicspeakingisacombinationof“performing”and“speaking”.
A. 对
B. 错
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