七大洲中,四周被海洋环绕,终年冰雪覆盖,至今无人定居的大洲是( )
A:大洋洲
B:南极洲
C:亚洲
D:非洲
菱形ABCD中,AC=10cm,BD=24cm.则菱形的面积为 ( )
Annie has a ___________,and she is going to see her dentist today。