A:Excuse me.
B:Can you help me?
C:Thank you very much.
已知x+x﹣1=3,那么x2+x﹣2=____.
图为人体消化、呼吸、循环、泌尿等系统的生理活动示意图,请据图回答:
下列关于动物在自然界中作用的例子,叙述不正确的是( )
---________ do you like giraffes?
--- Because they are beautiful.