牙齿固连是指
A．两牙融合B．牙根外露于龈粘膜外C．牙齿与骨组织融合D．乳牙过了替换年龄仍滞留于口腔E．牙萌出困难
参考答案：C
A．Britain and the US have proposed writing off more than 30 million dollars of debt with Africa.
B．About five million African children under the age of 5 are dying every year, many from preventable, treatable diseases.
C．International efforts to reduce hunger and infant mortality are falling short of their targets.
D．In 2001, the United Nations adopted eight ambitious development goals to be achieved by 2015.
扁桃体切除术后创面上的纤维素膜一般形成于（）
A.术后6小时内
B.术后6~12小时内
C.术后24小时以后
D.术后5~6天
E.以上均不是
