已知点P1（a﹣1，4）和P2（2，b）关于x轴对称，则（a+b）2009的值为[ ]
A．72009
B．﹣1
C．1
D．（﹣3）2009
答案：B
_____ for his mistake, the little boy could not but _____to his teacher that he was wrong.
A．Blaming; to admit
B．Blamed; admit
C．To blame; admitted
D．To be blamed; admitting
交界性肿瘤
