如果-x=-5,那么x=?如果-a=a,那么a=?
1-2+3-4+5-6+7-8+...-100+101=?
-1+3-5+7-9+...-97+99=?
It is a red pen in English.对a red pen 提问
My computer is very new.改为一般疑问句
That is a baseball.改为反问句
these是?代词
That is a yellow pencil.就a yellow pencil提问
一般疑问句是什么