A. It's on the line.
B. Yes,it is.
C. No,I haven't.
D. No,she doesn't.
E. Yes,he has.
画法:①联结____并延长____到点A′,____=____,于是得到点A的对称点____;
②同样画出B、C、D的对称点____、____、____;
③顺次连结____、____、____、____得四边形____就是所求四边形.
“一腔热血育桃李,三尺讲坛写春秋。”这句诗的寓意是( )
经度相同的两个地方( )