--- Did you at the party, Owen?
--- Yes, I was very happy.
A:enjoyed yourself
B:enjoy yourself
C:enjoy yourselves
D:enjoyed himself
为了美化城市,经统一规划,将一正方形草坪的南北方向增加3m,东西方向缩短3m,则改造后的长方形草坪面积与原来正方形草坪面积相比( )
180°经线与赤道有几个交点