I feel it is you rather than the boy who________for being late for the speech. [ ]

A . is to blame  

B. are to blame

C. is to be blamed  

D. are to be blamed

在正常情况下，Water位X线片上颌窦密度与眼眶密度相比（）

A.上颌窦密度高于眼眶密度

B.上颌窦密度高于眼眶密度

C.上颌窦密度等于眼眶密度

D.上颌窦密度低于或等于眼眶密度

E.因个体差异，无法相比