A:called her up
B:called up her
C:looked her up
D:looked up her
在△ABC中, AB=3,AC=1 ,∠A=30°,则△ABC的面积等于( )
A lot of trees _________ around here every year, and we can enjoy fresher air now.
“红军不怕远征难,万水千山只等闲。”当年红军“远征”的直接原因是