Many people leave their hearing problem untreated because
A.it is not serious.
B.Crystal Ear is not yet available.
C.it is not easy to have it treated.
D.they don’t want to look old.
第9题
A.一次凭证是指一次填制完成,只记录一笔经济业务的原始凭证
B.并非所有外来原始凭证都属于一次凭证
C.一次凭证是一次有效的凭证
D.大部分的自制原始凭证都属于一次凭证
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