我国公民平等地承担的义务有( )
①服兵役 ②遵守宪法和法律
③依法纳税 ④维护国家统一和民族团结
A:①②③
B:②③④
C:①③④
D:①②③④
提示:⒈When and where will you go?
⒉How will you get there?
⒊How long will you stay there'?
⒋What will you do there?
⒌Why do you want to do these things there?
My holiday plan
我国领土大部分位于( )
已知椭圆曲线方程为 x2+y2n=1(n∈R) ,两焦点分别为F1,F2.