哪些账户可以办理信用卡还款？（）
A、非签约的龙卡通
B、签约的准贷记卡
C、签约的活期存折
D、非签约的定期一本通
参考答案：A, B
— _________, this math problem seemed quite simple to me, but when I tried to work it out, I just couldn’t.
— There are always things like this, I think.
A．On one hand
B．In my opinion
C．At first sight
D．On its own
下列均为肉瘤好发部位，除了（）
A.颈
B.肩
C.胸
D.背
E.臀
