A:冰全部熔化
B:冰有少部分熔化
C:水有少部分凝固
D:冰和水的原有质量不变
They had received no news of him since his ____ (离开) from the island.
下图为某国总人口和城市人口增长统计图。根据图中信息可知,目前该国人口增长模式最可能是( )