Tired _______ he was , he decided not to trouble her.
A.as
B.although
C.unless
D.even if
答案:A
发票的真伪由()鉴定。
A、税务机关
B、公安机关
C、工商机关
D、海关
图书馆书目检索系统查询图书的途径有哪几种?