托收承付方式中付款人累计（ ）次提出无理拒付的，付款人开户银行 应暂停其向外办理托收。
A．3
B．4
C．5
D．2
参考答案：A
–What did your parents think about your decision?
–They always let me do _______ I think I should.
A．when
B．that`
C．how
D．what
牙源性角化囊肿衬里上皮的组织来源是
A．结合上皮
B．缩余釉上皮
C．Malassez上皮剩余
D．Serres上皮剩余
E．牙 * *
