Higher temperatures turning the large ice sheet to water would cause ______    rise in sea level worldwide and change ______ weather on earth.

A．a; /

B．the; /

C．a; the

D．/; the

第一足月分娩，胎盘30分钟未娩出，检查子宫下段有一狭窄环。

此时最恰当的诊断为______

A．胎盘嵌顿
B．胎盘植入
C．胎盘残留
D．胎盘剥离不全
E．胎盘粘连