子宫内节育器常会发生以下哪些情况（）
A.位置下移
B.带环妊娠
C.嵌顿肌层
D.脱落于腹腔
E.以上都是
参考答案：E
At first ______, the bag seems made of real leather. But actually it is just an imitation.
A．sight
B．look
C．appearance
D．view
短期国债的发行主体是中国人民银行。( )
