Analog input pins 8-15 on Arduino Mega

I't seems that analog input pins 8-15 are very different from that 0-7. I can't made them work as I did on 0-7. I mean, is there any C sentence in Arduino IDE(Ver. 0017) , which can make analog input pin 8-15 work?

Thanks a lot!

I believe it's going to be fixed in 0018, but here's the post about it, and how to fix it:


thank you, very much!